Discard any rubber sealing washers. Slacken and remove the blanking plug 4 on the side of the governor cover opposite to the maximum fuel stop or boost control device. Discard any sealing washer. Note: For pumps fitted with boost control, maximum fuel adjustment is incorporated within the boost control device 6.
If the pump is not fitted with a boost-control, remove the maximum fuel stop screw 3 ; discard the rubber sealing washer. Lift the lever 4 and release the tension of the spring 5.
Remove the lever, spring and dust cover 6. Remove the four Torx screws at 1 , 4 , 5 , and 6. Lift off the cover and pull the throttle shaft 3 out of its bore. Remove and discard the "trapped" O-ring 1 from the sealing face of the cover.
Remove the exhaust brake shaft 2 and discard its O-ring. B Governor covers fitted with hydraulic excess fuel Using suitable circlip pliers, remove the internal circlip from the governor cover. Lever out the closing plug and remove and discard the Oring Note: At the later stage depending on which other features are fitted when removing the governor cover, the hydraulic excess fuel device has to be disengaged. Grip the governor cover firmly and hold the excess fuel piston with the thumb so as to disengage the fork in the control bracket from the excess fuel pin Lift the governor sufficiently to release the excess fuel pin from the fork and then release the excess fuel piston.
Remove the hydraulic excess fuel piston. From inside the governor cover, use the excess fuel piston to push out the excess fuel assembly. Separate the sleeve and discard the O-ring Remove the external 'e-clip' , spring and pin guide from the excess fuel pin Note: Take care when releasing the plug as it will be under pressure from the pre-load spring if fitted. Remove the shim s from the plug and the preload spring from within the cover 2 , if fitted.
Remove the two securing screws 1 and 3 and remove the cover. Note: Securing screws 1 and 3 and plug 4 may be of the temper resistant design. To remove these, a special tamper resist Torx bit will be required. See Section 6. Hold the nut 2 with a spanner; use an Allen key to remove the fuel adjustment screw 1 from the adjustment screw body.
Carefully lever out and discard the O-ring 3 from its recess in the rear of the diaphragm assembly. Unscrew and remove the diaphragm stroke adjustment screw 1 from the screw body 2. Remove and discard the O-ring from the adjustment screw. Note: As the adjustment screw body is unscrewed, check that the "Eslok" patch on the thread still creates a tight fit in the governor cover thread. If it is not, the body must be discarded. Remove the shim s 2. Detach the housing 3 ; carefully remove and discard the O-ring 5.
Check the spring pin 4 for damage; if necessary, replace it. Unscrew and remove the plug, using the appropriate size of Allen key, and discard the O-ring 3. Remove the large spring 4 , the spring plate 5 if fitted , and the small spring 6 if fitted. Remove shim 2 from inside preload plug. Note: 1 The preload plug fitted to later pumps may be chamfered at its outer end, to prevent unauthorised tampering.
Note: 2 It may be necessary to re-position the pump on the Hydraclamp mounting plate to gain access to the preload plug. A plastic tamper proof plug will be fitted into the hexagon hole in the plug and must be removed for fitment of the appropriate Allen key. If the pivotplug is to be removed, slacken it by no more than one turn before removal of the governor control cover to avoid the risk of damage to internal components.
Slacken and remove the plug; discard the O-ring 7. Remove the preload spring 9 and remove the shim 8 from the plug. Note the position of the air inlet connection 2 on the boost control cover relative to the fuel backleak return connection 1. Slacken and remove the two cover fixing screws and their flat washers. Remove the cover and the diaphragm assembly 1.
If fitted, remove the shim from within the "cup" in the lower face of the diaphragm assembly. Note: 1 Do not dismantle the diaphragm assembly.
If any part of it is worn or damaged, the whole assembly must be replaced. Note: 2 The spring 2 , spring seat 3 , and spindle 4 , cannot be lifted out at this stage, as they are retained by the cam follower and a circlip within the governor cover.
Lift and rotate the cover off towards the torque trimmer side, and pull the throttle shaft 3 out of its bore. Remove and discard the "trapped" O-ring 7 from the sealing face of the cover. Note: If the control cover is lifted too far, the carriage angle plate may become distorted; if resistance is felt, lower it and move it further away, then lift it again. Remove the governor main spring 3 from the throttle shaft link, noting the hole into which it is fitted. Lift off the control cover and discard the trapped O-ring 4.
Discard the small transfer gallery O-ring that is in the housing recess below the small hole 5. Use a suitable piece of soft metal or plastic rod to push the plug 4 out of the cover: discard the Oring 3.
Remove the washer 4 not visible from the spindle. If no boost control is fitted to the governor cover and the cam follower is carried on a "pivot plug", remove the small circlip 2 and the cam follower. Unscrew and remove the pivot plug 1 ; remove and discard the O-ring 3.
Removing the governor cover Remove the four fixing screws from the governor cover and gently lift the cover away from the housing. Disengage the governor spring, taking note of the throttle link hole number. Remove the lever and discard the O-ring Remove and discard the circlip from the end of the actuator shaft. Later designs use a 'Nyloc' nut.
Remove the lever and washers Removing the Actuator To remove the actuator from the control cover it is necessary to use a pair of "molegrips", as the screws securing the unit are fitted with tamperproof steel balls and tamper-evident washers Grip the washer and rotate it in an anticlockwise direction; this will loosen the washer and at the same time slacken the screw. Discard the screw, the ball and the tamperevident washer. Carefully remove the actuator from the control cover and then remove and discard the O-rings Detach the governor main spring 5 from the idling spring peg 1.
Remove the peg, idling spring 2 and pivot ball washer 3 from the governor arm 4. Remove the main spring from the throttle shaft link 6.
Remove and discard the two O-rings 7 and 8 from the throttle shaft. Note: Early pumps had a 3 hole link plate. A note must be made of which hole is used to locate the spring.
The appropriate Service Test Plan will confirm the correct hole to use. Tip the "shouldered" end of the pin upwards, to clear the spring stop and carefully release and remove the pin and spring 4. Note: If it is difficult to grip the pin, carefully slacken the spring stop screw 1 and allow the stop to swing away from the pin, again taking care to avoid rapid ejection of the pin.
Slacken and remove the control plate screws 3 , 4 , 6 , and 8. Lift out the bracket 7 , together with the control arm assembly 1 and the metering valve 5 , from the pump housing. Discard the tab washers. Remove the pivot ball washer 3. Withdraw the linkage hook 9 , with the fibre washer 4 and spring 6 from the governor control arm 5 ; remove the spring retainer 7 , and metering valve assembly 8 from the linkage hook.
Rotate the screw anticlockwise to disengage it from the scroll link 4. Discard the retaining clip 2. Lift the screw to disengage the retaining clip from the angle plate 3. B Removing the angle plate To remove the angle plate 1 , rotate it anticlockwise until it can be lifted up between the arms 2 and 3 of the scroll link plate as shown. If fitted, remove the four support plate screws at position 6 and 8 and the pump-to-engine support bracket 7.
Unscrew and remove each high pressure outlet, using a long-reach socket. Remove and discard the seating washer from the bottom of each outlet bore. The high pressure outlets may be pressurising valves which are factory-sealed units and cannot be serviced. Remove the delivery valves, delivery valve springs and pegs. Delivery valve holders must be discarded. Slacken, but do not remove, the fuel inlet connection 1.
Slacken and remove the four endplate screws 2 , and 4 and remove the endplate assembly 3 complete. Tip out the filter 3. Remove and discard the adjuster 4 and the O-ring on current designs. Screw the extractor 13 into the regulating sleeve 6 and pull the sleeve out of the end plate. Remove the piston retainer 10 , the piston 8 , and the regulating spring 5 ; remove and discard the Oring 9 from the groove 7. Tip out the sleeve retaining spring 11 and the spring seat washer Note: The piston, sleeve and adjuster are matched and are not interchangeable.
Remove the sandwich plate Note: If damaged carefully remove the sandwich plate locating pin from the end plate using a long nose pair of pliers. Note the particular hole in the endplate too which it is fitted. Incorrect fitting will effect transfer pump operation. Non-viscosity compensating design Remove the fuel inlet connection and discard the O-ring Tip out the retaining spring , filter , adjuster assembly , regulating spring and peg and piston Invert the end plate and lightly tap it on a flat surface, taking care not to damage the aluminium face of the end plate and remove the regulating sleeve , sealing washer and priming spring Remove any detachable electrical connection screw s or nut 6 , washer 7 and connection 5 , depending upon the type of ESOS fitted; slacken and remove the ESOS body 1.
Remove the armature or plunger 4 and spring 3. Remove and discard the O-ring 2. If no ESOS is fitted, a solid plug will take its place if so, remove the plug and discard its O-ring. Note: On later solenoids, the spring is attached to the plunger and is retained within the body.
Remove the transfer pump sealing ring 1. Carefully lift out the liner together with the two pairs of transfer pump blades 3 and their separating springs not visible.
If fitted, remove the spring and poppet valve, which are retained within the barrel by the liner. The springs are very small and could be easily mislaid. Note: Care must be taken to avoid damage to the blade rubbing faces during storage or assembly. Hold the transfer pump rotor with the special tool 2. Slacken but do not remove the rotor; the direction in which it is to be slackened can be determined by examination of the end face of the rotor. Rotors marked with an arrow indicate the direction in which to turn the rotor to remove it.
Remove the tools; drive hub and key, leaving the rotor just finger-tight. DP utilises a number of different advance devices. They fall into two main categories; a. Single piston design. Direct actuation of the cam-ring by an advance piston operated by transfer pressure and controlled by a combination of spring and cambox pressure. Servo piston design. Indirect actuation of the cam-ring by an advance piston via a servo valve operated by transfer pressure and controlled by a combination of spring and cambox pressure.
Each of these two types may be fitted with cold start timing retard with or without a wax motor mechanism. As the CA device may be fitted to the auto advance housing with the wax motor facing in one of two positions, note the direction in which it is fitted. Slacken and remove any cable retaining nuts and washers. Slacken and remove the wax motor 4 ; discard the O-ring 3. If the plunger is partially or fully removed from the body, operation of the motor will be severely impaired by the ingress of air into the body of the motor.
The ball valve seat is a press-fit in the CA housing. Do not attempt to remove the ball valve seat, ball, or spring. If there is a problem with the assembly, it must be replaced. Slacken and remove the two Allen screws 1 and 2. Remove the start-retard spring from the advance housing, if fitted not shown.
Grip the piston 2 lightly in a vice fitted with soft jaws. With a suitable screwdriver, slacken and remove the screw 9 and remove the phase plate 8 , stop plug 7 , stop tube 6 , outer spring 5 , inner spring 4 , and shims 3. Remove the piston from the vice. Note: Early pumps may be fitted with pistons that have small "flats" to assist with clamping in the jaws of a vice.
Slacken and remove the Allen screws 1 and 2. C Removing the advance device. Slacken and remove the pressure end cap and O-ring An auxiliary spring may be fitted. Slacken the head locating fitting , or transfer pressure damper if fitted , no more than three turns. Tap the advance housing with a softfaced mallet to free it from the gasket Remove the head locating fitting and then the advance housing, complete with the piston.
Discard the gasket If fitted, carefully remove the spring ring retaining the lock-off ball in the head locating fitting and remove the ball. Discard the spring ring. Remove and discard the split nylon ring , if fitted, and the O-rings from the head locating fitting.
The piston sleeve and piston may still be retained within the housing Remove the piston and one of the O-rings , then lightly grip the housing in a vice fitted with soft jaws and with a suitable flat bladed screwdriver lever out the sleeve using the O-ring groove. Discard the remaining O-ring The housing and piston assembly contains a servo valve within the advance piston. Removal of the piston from the housing will enable the servo valve assembly to be dismantled.
This device consists of a number of springs and shim washers that are under compression. Care must be exercised when dismantling the unit. Remove the retaining circlip , using a suitable pair of circlip pliers. Clamp the piston in a vice fitted with soft jaws with the spring assembly uppermost.
A suitable large flat steel washer having an internal hole diameter of between 7 and 8 millimetres can be used to compress the springs and shims to enable the retaining e-clip to be removed. Carefully release the spring pressure and remove the shim , plate , spring , stop plate , spacer , shim and spring The servo valve retaining circlip and washer can be removed to release the valve from the piston.
Some pumps may have an additional spring fitted in the piston bore beneath the servo valve. Slacken and remove the wax motor ; discard the O-ring Remove the cam , spring and spring seat from within the CA housing Slacken and remove the four Allen screws C Removing the advance device Slacken and remove the spring end cap and O-ring An auxiliary spring may be fitted not shown.
Remove the advance housing cap-nut ; remove and discard the sealing washer D Dismantling the piston and servo valve. Remove the servo valve from within the advance piston.
Carefully remove the circlip , washer If the servo valve is removed from the advance piston for future inspection, note the way round it is fitted into the piston. Unscrew the advance piston spring cap 3 ; remove and discard O-ring 4. Remove the main advance springs 6 and 7 , and shim s 5. Unscrew the piston plug 12 ; remove and discard the O-ring Remove the spring plate 8 , circlip 9 , and the retard spring 10 if fitted. Note: The start retard spring 10 and the end plate regulating sleeve retaining spring have similar dimensions, but their ratings are different.
As this may cause confusion during reassembly, the springs must be separately identified. B Removing the advance device Remove the advance housing cap-nut 8 ; remove and discard the sealing washer 9. Slacken the head locating fitting 5 , or transfer pressure damper if fitted , no more than three turns.
Tap the advance housing 2 with a softfaced mallet to free it from the gasket 1. Remove the head locating fitting and then the advance housing, complete with the piston Discard the gasket 1.
If fitted, carefully remove the spring ring 6 retaining the lock-off ball 7 in the head locating fitting and remove the ball. Remove and discard the split nylon ring 3 , if fitted, and the O-rings 4 from the head locating fitting.
C Removing the cam screw Fit the special adaptor 1 to the cam advance screw 2. Using a suitable socket and wrench, slacken the cam screw. The cam ring will almost certainly become stuck in the pump housing. If the cam ring has become stuck, remove the wrench and socket from the adaptor; remove the adaptor from the cam advance screw and tap the adaptor sideways with a soft-faced mallet until the cam has been released. Remove the cam screw from the cam ring.
Slacken the locking nut 8 before removing the valve body 3 from the pump. Remove the locking nut and discard the seal 7. Remove the adjusting screw 6 and spring 5. Tip out the ball 4. Remove and discard the O-rings 1 and 2. Remove and discard the filter if fitted. If fitted, remove and discard the filter. Unscrew and remove the adjuster and discard the O-ring Tip out the spring and ball Slacken the valve body 8 and remove the valve assembly. Note: The inner O-ring 10 may remain within the pump housing Remove and discard the O-rings 9 and Discard the washer 11 and filter in the end of the valve body if fitted.
Remove the adjuster 1 from the sleeve 4 and discard the seal 3. Remove the sleeve from the body 8 and tip out the spring 6 and valve 7. Remove and discard the O-rings 9 and Note: The rear scroll plate may adhere to the face of the hydraulic head, if it does, remove it. Place a plunger retaining cap 1 over the rotor; remove and discard the large O-ring 2. Keep the hydraulic head either in a bath of clean test oil, ensuring that the exposed part of the rotor is covered or in a clean plastic bag until it is required for reassembly.
Note: 1 The roller shoe 1 in the rotor tang drive slot 2 is longer than the others. Note: 2 On some later designs, all 4 shoes are the same length. C Dismantling the drive shaft assembly Note: If the drive shaft is to be replaced, the components fitted to the shaft may be transferred if they are suitable for further service.
D Removing the catch plate and the support plate If the roller cage and support blocks are to be removed, place a suitable "tommy bar" 5 through the transverse hole in the drive shaft; grip the drive shaft lightly in a vice fitted with soft jaws, using the tommy bar to resist the slackening torque. Use a Torx screw bit and adaptor to remove the four catch plate screws 2 and 4. Remove the catch plate 3 and shoe plate 1. Invert the drive shaft and grip it very lightly, across two diametrically opposite roller shoe gaps, in a vice fitted with soft jaws.
Use an extended Torx screw adaptor to slacken the three screws 1 , 2 , and 3. Remove the screws, their flat washers, and the support blocks. Align a gap 1 in the weight cage with the centre line of the pump so that the gap that will be diametrically opposite will allow the weight cage to pass the head of the advance device stud as the pump housing is withdrawn.
Lift the housing off the drive shaft assembly. B Dismantling the drive shaft assembly Lift the drive shaft 1 , governor weight cage 2 , weights 3 , and thrust sleeve 4 together from the spacer 5 , scroll plate 6 , cam ring 7 , and scroll plate 8.
Remove the drive plate. Remove the dowel pins 2 and 4 fitted to the cheek plate design and the upper cheek or check plate 6. Unscrew and remove the transfer pump rotor, lift out the hydraulic head rotor and remove the lower check or cheek plate 2. Refit the rotor to the hydraulic head, and then refit the transfer pump rotor finger tight. Store the head in a covered container filled with clean test oil.
Note: 1 Some basic designs of pump will not be fitted with a bearing or scroll plates. After removal of the cam ring, remove the circlip fitted in the pump housing before removal of the weight cage. Some pumps will have a two piece thrust ring, a retaining ring sandwiched between the thrust sleeve washer and governor weight cage.
Carefully remove the retaining ring 2 and remove the two halves of the thrust ring 1 noting the 'stepped edge' for locating into the weight cage.
Remove the screw and discard the O-ring. Remove the pump housing from the Hydraclamp and place it on the workbench with the drive shaft seals uppermost. Using the special seal removal tool, carefully lever out the seal 1 noting the way round the seal is fitted into the housing. If two seals are fitted, remove the circlip spacer and using the special seal removal tool, carefully lever out the seal noting the way round the seal is fitted into the housing.
If water contamination is suspected, carry out an initial examination of all internal components before attempting any further cleaning. Clean out all passageways in the head and rotor by flushing out with clean test oil.
Also inspect for unusual marking, deposits, odour, seal swelling in the housing, in which case degraded RME fuels may be a factor. Note: If light load advance is specified, the metering valve will be matched to the hydraulic head. The following groups are matched and must be kept assembled in their sets: Rollers and shoes Advance housing and piston Cam ring and scroll plates Stop solenoid plunger and body Regulating sleeve, piston and adjusting screw Governor cover and torque control piston If any part of a matched set is considered to be unfit for further service, the whole set must be replaced.
Note: The pump housing drive shaft bush is not a service repair item; if the bearing is worn, the housing must be replaced. All components must be checked for corrosion, wear, or damage. Under service workshop conditions it is not feasible to test individual parts or sub-assemblies to determine their suitability for further service.
Close examination of the areas vulnerable to damage, and interpretation of the results of tests prior to dismantling, should indicate the condition of parts. Corrosion Check for signs of corrosion or water ingress rust or staining damage to machined surfaces.
These include the pump housing, drive shaft, hydraulic head bore, metering valve and bore cam ring, scroll plates, cheek plates end plate and auto-advance device mounting face. Wear Inspect drive shaft splines and associated parts for wear or damage.
If excessive end-float or radial play was detected prior to pump strip-down, examine the drive shaft thrust washer and housing bearing thrust face, governor backplate and thrust face of drive shaft, and governor drive splines, for wear. Damage Inspect all parts for damage or bending due to abuse, especially external levers and controls.
Note that overhaul kit does not include drive shaft seals, which are stocked as separate items. When fitting new O-rings and oil seals, care must be taken to use protection caps to avoid damage to the seals. O-rings must be dipped in clean test oil prior to being assembled.
External seals must be lightly coated with the specified grease. Where possible, inspect seals for small cuts after assembly.
Examine the running surface very closely for signs of erosion, particularly the area around the delivery port. If significant erosion is evident, the head and rotor assembly must be replaced. Also check the condition of the drive tang on CP drive pumps. Replace the hydraulic head if the plungers show severe scratching. Clean each plunger with test oil and immediately replace it very carefully in its original bore, the same way round.
The recommended plastic retainer, or short lengths of clean nitrile rubber tubing, should be used to retain the plungers in their bores.
Note: 1 The two pairs of plungers are of different lengths; the two longer plungers are fitted in line with the axis of the rotor delivery port. Note: 2 DP pumps specified with light-load advance will be fitted with "graded" metering valves.
Refer to the appropriate parts list for details. If there are significant signs of pitting or "smearing" they must be replaced as a set. Smearing is the result of failure of the surface due to abrasion or overloading, which may be due to excessive hydraulic pressure possibly caused by nozzle blockage. Pay particular attention to the condition of the contact surfaces and check that the rollers rotate freely in their shoes.
If the cam ring has failed, the rollers and shoes may also have been severely damaged. If satisfactory, rollers must be replaced in their original shoes. Check the blades for chips, scores or breakages. Examine the blade springs for distortion Blades must be replaced in sets and must be of the same type as the originals. Examine the rotor for wear or damage.
Examine the liner for corrosion or scoring and replace it if there are any signs of damage. Replace it if there is any significant scoring. If the sandwich plate is scored or worn, it must be replaced and not reversed. The transfer pressure accumulator retainer must not be protruding. Replace if faulty. Examine the metering valve for "stepping" of the control slot edges and at the point where it enters the bore in the hydraulic head.
Check that the valve and the governor link pin are securely fixed in the bar and that the roller is free to rotate on the pin and is not worn. Check the regulating sleeve and piston and differential valve for damage, corrosion or blockage of orifices. Replace them as matched pairs if necessary.
If movement of the cambox pressurising valve can be detected when shaken the spring may have collapsed, in which case the whole assembly must be replaced, as it is factory-sealed.
Very carefully examine the areas of contact with adjoining components spring pegs, throttle shaft links etc. Check that all springs specified in the Parts List for the pump are present. Check the cam advance screw flats, which may have been damaged by careless application of the high tightening torque. Check all threads for damage, especially on the transfer and distributor rotors, hydraulic head, cam advance screw hole, studs, fuel inlet and return and high pressure outlet connections. Check splines and keyways for cracks or chipping.
Check the tang slot on CP drive pumps. Examine the thrust surfaces on the inner face of the pump housing and the weight cage for damage or scoring. Examine the governor weight cage and weights for wear, cracks or damage. Ensure that the correct number and type of governor weights are fitted. If water has been present in the fuel it will tend to settle in the advance housing. Check that the piston moves freely.
If the bearing is unfit for further service, the housing must be replaced. If the small dowel pin, which locates the governor control cover, is damaged, it must be replaced. If the advance device stud is damaged and requires replacement, remove it by using two suitable nuts locked together. Fit a new stud using the same technique. Check the boost control locating dowel pin. Check the torque trimmer piston bore. Check that the flexible valve seat is in good condition, with no pitting or other damage, and that the spring is not distorted.
Check the coil for electrical continuity by measuring its resistance. Ensure that the solenoid is completely dry and check insulation resistance between each terminal and the solenoid body insulated return solenoids only.
Note: 1 A few solenoids are specified to be operated only when there is a requirement to stop the engine. Note: 2 If any fault is apparent in the stop solenoid assembly, the whole unit must be replaced.
Note: Early pumps may be fitted with pistons that have small flats to assist with clamping in the jaws of a vice. If a pre-dismantling test of the injection pump indicates that the CA device is not operating correctly, carry out the following test on the wax motor, out of the CA housing no test is necessary if operation is according to the Test Plan.
The motor may be tested for correct function by connecting it either to a fully charged 12 V battery, or to a stabilised DC power supply set to The test data refers to 12 V operation only - currents and times are significantly different for operation at 24 V. The motor is not polarity sensitive.
Before testing, place the motor on a flat surface, with the spindle downwards, and press lightly on the motor for about 15 seconds to ensure that the spindle is in its fully retracted position. Clamp the motor, with its spindle facing upwards lightly in a vice fitted with soft jaws. The wires, switch and fuse must be capable of carrying a current of 3 A without the overall voltdrop in the circuit exceeding 0. With the power supply switched off and the motor cold, the protrusion of the new motor spindle from the front face of the motor dimension "X" should be 4.
Switch on the power supply and allow at least one minute for the motor to reach its operating temperature, during which time the spindle will be extended from the motor housing.
The protrusion of the spindle must then be a maximum of 7. Failure to follow this instruction could lead to the ingress of air into the motor, with subsequent failure to operate correctly. Before using thread-locking compound, if specified, ensure that the mating surfaces are completely oil-free and dry.
When reassembling pumps, it is important to use the correct overhaul kit. The relevant kit numbers can be found in the Service Parts List. Lightly lubricate all flexible seals and O-rings with clean test oil before fitment to their respective components. Always use the correct protection cap when fitting new O-rings. Apply the specified grease to the drive shaft seal and the throttle and exhaust brake shafts before assembly in their respective positions.
Dip all internal components in clean test oil before assembly. Refer to the relevant Test Plan for details of special build items and any initial setting instructions.
Refer to Section 6 for all special tools and torque values. The direction of rotation of the pump, as shown on the nameplate, is as viewed from the drive end. Note: 1 Check the direction of the arrow on the distributor rotor head agrees with that of the arrow on the pump nameplate.
Note: 2 The plungers in four-plunger rotors must be fitted with the longer plungers opposite to each other and in line with the distributor port in the rotor. Leave the plunger clips 3 in position, remove the transfer pump rotor and carefully remove the distributor rotor from the hydraulic head body, avoiding any contact with the running surface of the rotor. Invert the rotor and lightly clamp the screw heads in a vice fitted with soft jaws.
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