MBW GP18 - Manual (Page 11)

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Belt Adjustment
Refer to MAIN ASSEMBLY, page 14.
1. Remove hardware(13) securing painted belt guard
(10) to engine deck and remove belt guard(10).
Remove plastic belt guard (7) for full access to belt.
2. Apply moderate thumb pressure to belt about half
way between pulleys. When properly adjusted the
belt should deflect approximately 3/8” (9mm). If the
belt is adjusted correctly reinstall belt guard and
hardware.
3. To adjust belt tension loosen (4) screws securing
engine to engine deck.
4. Push engine towards the back of the plate. While
holding pressure on the engine retighten (4) hex
head cap screws securing engine to engine deck.
5. Recheck belt tension as described in step 2 and
readjust if necessary until the proper tension is
reached.
6. Reinstall belt guards (plastic one first), using
hardware from step 1.
Engine Removal
Refer to MAIN ASSEMBLY, page 14.
1. Remove hardware and belt guards as described in
earlier section.
2. Remove (4) bolts securing engine to engine deck.
3. Slide engine forward and remove belt and engine.
Exciter Disassembly
Refer to MAIN ASSEMBLY, page 14.
1. Remove engine and belt guards as described in
earlier section.
2. Remove (4) screws securing engine deck to shock
mounts/base plate and remove engine deck.
3. Clean the entire baseplate to remove all dirt and
debris.
4. Drain exciter oil as described in Changing Exciter Oil
section of this manual.
Refer to EXCITER ASSEMBLY, page 12.
5. Remove set screw (16) securing pulley to exciter
shaft. Remove pulley (5) and shaft key (4).
6. Remove hex head flange screws securing exciter
covers to exciter housing. Remove exciter covers
and gaskets.
7. Remove exciter shaft by pressing the opposite of
pulley end of the exciter shaft towards the opposite
side of the housing. This will push the exciter shaft
and the bearing on the pulley side out of the exciter
housing. Press the bearing off of the exciter shaft.
8. Press the remaining bearing out of the exciter
housing.
9. GP18 only, remove and replace internal snap ring (7)
if required.
10. Check bearings for wear and replace if necessary as
described in Parts Replacement Cycles and
Tolerances section of this manual.
Exciter Assembly
Refer to EXCITER ASSEMBLY, page 12.
1. Prior to assembly, clean all parts in a suitable solvent
cleaning solution.
2. Inspect all part for wear or failure and replace if
necessary as described in Parts Replacement Cycles
and Tolerances section of this manual.
3. Replace all seals and gaskets at every overhaul or
disassembly.
4. All shafts and housings should be oiled prior to
pressing in bearings. Ensure that all bearings and
seals are pressed squarely and properly seated.
5. For proper hardware torque setting refer to Torque
Chart table in this section of the manual.
6. Press bearing (12) onto the pulley side of the exciter
shaft.
7. GP18 only, install retaining ring (7) into exciter
housing opposite of the pulley side.
8. Press bearing (13) into the exciter housing opposite
of the pulley side.
9. Support the bearing in the exciter housing while
pressing the exciter shaft into the housing. Press the
exciter shaft into the housing until the bearing on the
pulley side of the shaft is properly seated in the
housing.
10. Install a new seal into the pulley side exciter cover.
Lubricate lip of seal with fresh exciter oil.
11. Assemble a new gasket and pulley side exciter cover
to the exciter housing.
12. Assemble opposite side exciter cover and new
gasket to exciter housing. Install hex head flange
screws.
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