Hydraulic circuit right-hand cover - Removing and install the pump


Remove and disassemble the cover.


Take out the screws (2) and disengage and remove the pump (32). Remove the O'rings (22) (23). The locating pins (21) are force fitted into the cover.

Clean the components, replace any found to be defective. Check that none of the channels in the cover are obstructed.
Install the locating pins (21) (if necessary) to the cover.


On the cover, fit new O’rings (22) (23) in the recesses of the high and low flow rate channelsInside the cover, apply a bead C of Loctite 574 around the four pump fixing screw holesReinstall the pump on the locating pins.
Smear the screws (2) with Loctite 221 and tighten to a torque of 10 -12 Nm.
Reassemble and Install the cover.

Disassembling and reassembling the pump

Remove and disassemble the cover.


Clamp the pump in a viceUsing paint, mark the positioning of: pump stages, flange and plates. Take out the screws (2) (4).
Remove the closing plate (1). Remove the composite seal (3) and seal (38). Split the low flow rate stage (37) from the flange (14).
Take out the stage and the pinion / bearings assembly (7).
Remove the pinions (8) (9) from the bearing assemblies (5) (11). Pair the bearing assemblies. Each bearing is linked by a locating pin P.


Remove the composite seal (12) and seal (13).
Take off the flange (14), catchdog (15) and seal (16).
Loosen and remove screws (36). Take off the flange (35).
Remove the composite seal (33) and seal (34).
Split the high flow rate stage (32) from the flange (21).
Take out the bearing / pinion assembly.
Remove the pinions (28) (29) from the bearing assemblies (27) (31). Pair the bearing assemblies. Remove the composite seal (23). Remove seal (22).
Remove circlip (19) and drive out the bush (20).

Reassembly
Check and clean all components. Replace any defective parts. During reassembly, the bush (20) and the seals must be systematically replaced.
Insert the bush (20) in the flange (21) using a suitable fixture and fit and correctly position the circlip (19).
The pump comprises four bearing assemblies. The intermediary bearings (11) (31) possess a recess (E) to allow oil to pass to the low flow rate stage (37).


Install the bearing assembly (27) (without recess), centred by the pin (24), in the high flow rate stage (32). Turn lubricating grooves G towards inlet port O and groove R of the composite seal (23) towards the flange (21).


Place pinions (28) (29) of the high flow rate stage in the bearing assembly (27). The high flow rate pinions are larger.
Position the composite seal (23) and seal (22).


Assemble the high flow rate stage (32) on the flange (21) according to the marks made during disassembly.
Install the bearing assembly (31) (with recess), centred by the pin (30), in the high flow rate stage (32). Turn lubricating grooves G and recess E towards inlet port O, and groove R of the composite seal (33) upwards.


Position the composite seal (33) and seal (34). Assemble the flange (35) on the high flow rate stage (32) according to the marks made during disassembly.


Centre the flange (35). Tighten screws (36) to a torque of 40 - 47 Nm.
Reinstall the catchdog (15) on the flat of the driving pinion (28). Position the seal (16).
Assemble the flange (14) according to the marks made before disassembly.
Install the bearing assembly (11) (with recess), centred by the pin (10), in the low flow rate stage (37). Turn lubricating grooves G and recess E towards inlet port O, and groove R of the composite seal (12) towards the flange (14).
Position the composite seal (12) and seal (13).


Assemble the low flow rate stage (37) on the flange (14) according to the marks made during disassembly.
Place the pinions (8) (9) in the low flow rate stage while ensuring that the flat of the drive pinion (9) is correctly positioned in the catchdog (15).
Install the bearing assembly (5) (without recess), centred by the pin (6), in the low flow rate stage (37). Turn lubricating grooves G towards inlet port O and groove R of the composite seal (3) towards the closing plate (1).


Position the composite seal (3) and seal (38).
Centre the low flow rate stage (37) and assemble the closing plate (1) according to the marks made during disassembly.


Tighten screws (2) (4) to a torque of 40 - 47 Nm.
Manually check the rotation of the pump. Reassemble and Install the cover.

Adjusting the engine speed sensor

Install the engine speed sensor (16), having lightly smeared the threads with Loctite 542 or equivalent.
Screw the sensor fully home without forcing it until it makes contact with the pump pinion (29). Then unscrew it three quarters of a turn so as to obtain a gap of approximately 1mm between the sensor and the pump pinion. Tighten the nut (1) to a torque of 5 - 7 Nm.