Multi Pro 1200/1250Page 7 -- 22Drive Train
7. Slideoutputshaftw ithwormgearandbearingcones
into housing. Align output shaft worm gear with input
shaft gear.
8. Adjust output shaft end play.
A. Position one red (0.002”) and one blue (0.005”)
shim to both openings of gearbox housing.
B. Installbothoutputcaps(items6and25)(O--rings
andsealsnot installed on caps)togearboxhousing.
Torque cap screws 8 ft--lb (10.8N--m) while check-
ing for binding of shaft. If shaft binds as screws are
tightened, add additional shims.
C. After both output caps are installed, check end
play of output shaft. Shaft end play should be from
0.001” to 0.003” (0.025 to 0.076 mm). End play can
be adjusted by adding or removing shims from be-
tween output caps and gearbox housing. Total shim
thickness at one output cap should be within 0.005”
(0.13 mm) of the total shim thickness of the other
cap.
D. Checkgearcontactbyapplyingbluingcompound
to worm gear (item 3) teeth. Turnworm (input) shaft
while putting a slight load on output shaft. Inspect
contactongearbyviewing throughdrain plugopen-
ing in gear housing. Worm contact should be cen-
tered on both sides of the gear (Fig. 23). To adjust
gear contact while maintaining shaft end play, move
shim(s)fromone side ofthegear housing to theoth-
er.
9. Oncecorrectquantityofshimshasbeendetermined
andgear contacthasbeen adjusted,make finalassem-
bly of output caps to gearbox housing.
A. Remove output caps from gearbox housing.
B. Install new O-- rings into groove of output caps.
Apply light coat of grease on O--rings and gearbox
housing bores.
C. Taking care not to damage O--rings or shims,
install caps over output shaft and into housing.
D. Apply Loctite #242 to cap screw threads. Install
and torque cap screws 8 ft--lb (10.8 N--m).
10.Install seals into input and output caps.
A. ApplyalightcoatofPermatextooutsidediameter
of new shaft seal.
B. Topreventsealdamage,covershaftkeywaywith
sealprotector,cellophanetapeorotherthinmaterial.
Apply light coat of grease on seal lip and place seal
on the shaft with the seal lip facing in.
C. Press seal evenly into cap bore. Seal in output
cap s hould be flush to the cap face. Seals in input
caps should be recessed 0.040” (1.0 mm) into cap.
11.Install retaining ring to output shaft. Make sure that
retaining ring is fully seated in shaft groove.
12.If breather assembly was removed from gearbox,
apply Loctite #271 (or equivalent) to threads on each
end of nipple. Install nipple into gearbox housing and
then thread coupling onto nipple. Apply thread sealant
onto threads of breather and install breather onto cou-
pling.
1. Worm gear (output shaft) 2. Gear pattern
Figure 23
2
1
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