MBW GPR160 - Manual (Page 13)

- 10 -
not to scratch the inner diameter sealing surface
of the shift spool when removing the seals.
10. Remove the four flanged capscrews (#21), the
cylinder cover (#19) and the cylinder gasket (#18).
Be sure to remove all of the gasket pieces from
the hydraulic housing to provide a good seal
surface for the new gasket.
11. Remove the bleeder screw (#14) from its port on the
hydraulic housing (#16). Thoroughly clean and
inspect the bleeder screw for damage. Replace if
needed.
12. Clean and inspect the shift spool (#15) and the
hydraulic housing (#16).
13. Reinstall the bleeder screw (#14) into its port in the
hydraulic housing (#16).
14. Install the new cylinder gasket (#18), the cylinder
cover (#19) and the four flanged capscrews (#21).
15. Remove all mount gasket material from the input
shaft cover (#12). Be careful to keep debris and
gasket pieces from entering the exciter assembly
when cleaning the cover.
16. If you purchased the rebuild kit (MBW Part Number
17368) go to step #20.
17. Assemble the new seals (#6) to the shift spool (#15).
Note the orientation of the seal lips. Hint: use
hydraulic oil to lubricate the seal inner diameter
before pressing onto the spool. Beware the slot
cut on the shift spool it may be sharp. Press the
seal on “WITH” the slot and NOT “ACROSS” the
slot.
18. Assemble the new guide ring (#4) to the shift spool
(#15).
19. Thread the shift spool (#15) onto the shift shaft (#10).
Note the left hand thread.
20. Install a new mount gasket (#17) on the hydraulic
housing (#16).
21. Guide the hydraulic housing over the shift spool seals
and guide ring and secure the cylinder mount plate
(#20) to the input shaft cover (#12) using the four
flange screws (#22) removed in step 5 using
LOCTITE #243 on the screw threads. Bleeder screw
to be positioned straight up Note: Tighten the
screws in a criss-cross pattern, tighten evenly to
prevent cocking the cylinder mount plate.
22. Clean and reattach the hydraulic line (page 20 #16)
to the 90 degree fitting (#13) on the hydraulic
housing. Be sure the hydraulic line does not bind
in the grommet. Loosen and rotate the hydraulic
fitting (#13) and rotate it as required.
23. Follow the steps for Bleeding And Adjustment Of
Hydraulic Controls section of this manual.
24. Reinstall the side cover (8) removed in step 2 using
LOCTITE #243 on the flange screws (21).
25. Lower engine deck to level position and tighten hex
nuts (#31).
Bleeding And Adjustment of Hydraulic
Controls
Refer to figure 2 on next page.
1. Remove the six flange screws (#2) securing the side
cover (#3) to the recoil/oil drain side of the baseplate.
Loosen hex nuts (#1) on the oil drain side only. Lift
the engine deck up to allow the side cover to be
removed.
2. Position the handle in the operation position as
shown with shift lever in the forward position.
3. Check the hydraulic line (#4) for loose fittings and
tighten as needed.
4. Remove the socket head plug (#7) from the control
head.
5. Place a drip pan or shop rag below the bleeder to
catch any excess oil.
6. Fill the control head with hydraulic fluid as shown in
the Maintenance - Checking Hydraulic fluid section of
this manual and reinstall plug (#7).
7. Loosen the bleeder screw (#5) located at the
hydraulic control housing of the exciter.
8. The system should start to gravity bleed itself after a
few minutes, If it does not slowly pull the shift handle
to the reverse position. Holding the handle in reverse
close & tighten the bleeder screw. Refill the control
head with hydraulic fluid and repeat as needed until
there are no air bubbles in the hydraulic system.
9. After the air bubbles have been removed, tighten the
bleeder screw (#5) and adjust the hydraulic oil level
in the control head by pushing the shift handle to the
forward position and then pulling it into the reverse
position until it stops. Repeat this procedure two
times.
10. With the shift lever in the forward position fill the
control head with hydraulic oil as shown in step 6.
11. Reinstall the socket head plug (#7).
12. Reinstall the side cover (#3) removed in step 1 using
LOCTITE #243 on the screw threads (#2).
13. Lower engine deck to level position and tighten hex
nuts (#1).