MBW GPR160 - Manual (Page 15)

- 12 -
26. Note: performance of the following steps will
require replacement of the ball bearings (#3).
M-B-W recommends replacement of these
bearings as a set at every complete disassembly
or rebuild.
27. Remove the internal retaining ring (#8) from the helix
pin carrier (#9) and remove the shift shaft (#10) and
bearings (#3) as a subassembly from the carrier.
28. Remove the e-clip retaining ring (#5) securing the
bearings to the shift shaft.
29. Secure the bearings in a vice and press out the shift
shaft (#10). Note the position of the spacer
washer (#7).
Handle Disassembly Procedure
Refer to Main Assembly, page 20.
1. Disconnect the hydraulic line (#16) from the fitting
(page 26, #9) in control head of the handle. Use a
drain pan to catch the hydraulic oil.
2. Disconnect the throttle cable (#14) from the engine.
3. Remove the two flat head socket screws (page 26,
#22) securing the throttle lever (page 26, #7) to the
handle and remove the throttle lever and throttle
cable as a subassembly from the handle.
4. Remove the four hex head flange screws (#26)
securing the handle mount (#4) to the engine deck
(#18).
5. Remove the handle assembly from the main
assembly.
Refer to Handle Assembly, page 26.
6. Remove the four flat head socket screws (#34)
securing the spindle mounts (#6) to the shockmounts
(#21).
7. Remove the four hex head flange screws (#33)
securing the shockmounts (#21) to the handle (#8)
from inside the tube.
8. Remove the jam nut (#32) securing the threaded rod
(#2) to the handle and remove the handle bumper
shockmount (#3) and threaded rod.
9. Drive the spirol pin (#30) from the control handle
(#17) and separate the control handle from the
control shaft (#20).
10. Remove the four hex head flange screws (#31)
securing the handle bars (#11 and #12) to the handle
(#8) and remove the handlebars from the handle.
11. Remove two self tapping screws (#1) from handle
tube (#8) and remove tube cap (#13)
12. Remove retaining rings (#5) from control shaft (#20)
and two flange lock screws (#25) from shift bracket
(#10) and slide control shaft (#20) out of handle tube.
13. Remove bearings (#14) from handle tube (#8).
14. Remove four flange lock screws (#28) from control
head (#9) and slide control head out end of handle
tube (#8).
15. Remove shoulder bolts (#18), washer (#27) and
locknuts (#26) from shift linkage (#16).
Control Head Disassembly Procedure
Refer to Control Head Assembly, page 28.
1. Remove the hydraulic fitting (#1), adapter fitting (#14)
and O-ring (#3) from the control head housing (#7).
2. Push piston shaft (#12) out of control head by lightly
tapping the exposed end, being careful not to
damage the shaft.
Note the orientation of hydraulic seal (#5) lip direction.
3. Remove seal (#5) and guide bearing (#10) from shaft
(#12).
4. Remove seal cap (#13) and washer seal (#2) from
control head (#7).
Note: When removing seals be careful not to scratch or
damage seal mounting surfaces.
5. Remove hydraulic seal (#9), guide ring (#11) and
wiper seal (#8) from seal cap (#13).
6. Remove socket pipe plugs (#6) from control head
(#7).
7. If Required use a 1/4” pin punch to drive the slide
bushing (#4) out of the control head (#7).
Clean the control head (#7) to remove any dirt or debris,
making sure all ports & passages are open.
Baseplate Assembly Procedure
Refer to Baseplate Assembly, page 22.
1. Clean all baseplate components.
Note: Make sure the bearings and their inner races are
kept as a matched set.
2. Inspect all bearings, shafts, helix pin carrier and
gears for wear, debris and discoloration from heat.
Replace as needed. Replace the roller bearings
and the inner races on each shaft as a set (both
bearings on the shaft) as needed. Replace the
helix carrier ball bearings as a set at each
complete disassembly or rebuild. Replace all
seals and gaskets removed at each disassembly
or inspection.
3. Install the input shaft cover seal (#5) into cover (#9).
4. Press the roller bearings (#4) into all four of the
covers (#7, #9 & #17). Note: Make sure the
bearings and their inner races are kept as a
matched set.