Multi Pro 1200/1250 Page 7 -- 21 Drive Train
7. Remove seals from open caps taking care not to
damage seal bores. Clean seal bore in caps. Remove
and discard O--rings from caps.
8. If required, press bearings from worm (input) shaft
(item 26).
9. Ifnecessary,removebearingc upsfromoutputcaps.
Make sure to remove bearing c ups evenly to prevent
damage to output caps.
IMPORTANT: Do not attempt to remove both bear-
ing cones and gear from output shaft at the same
time. The key (item 4) will cause severe damage to
gear, shaft and bearings.
10.If worm gear (item3) and bearing cones (item 2)are
toberemoved from outputshaft,support bottomsideof
gear and press shaft down through one bearing cone
and gear (Fig. 21). Remove key from shaft. Second
bearing cone can then be pressed from shaft.
11.Thoroughly clean all gearbox components and in-
spectfor evidence ofwearordamage. Replace internal
components as needed.
Assembly (Fig. 20)
1. If removed, install bearings onto worm (input) shaft.
Press on the inner bearing r ace until the bearing is tight
against the shaft shoulder.
2. If removed, press bearing cups into output caps.
3. If worm gear and bearing cones were removed from
outputshaft,fitkeyintooutputshaftandposition gearto
shaft.Pressgearontoshaftuntilthe geariscenteredon
the key (Fig. 22). Pressing on the inner bearing race,
installbearingconesuntiltheyaretightagainstthegear.
4. Slide worm (input) shaft with bearings into housing
noting correct orientation of shaft ends.
5. Adjust worm (input) shaft end play.
A. Position new shims to gearbox housing.
B. Install both open caps (item 14) (O--ring and seal
notinstalledoncap)togearboxhousing.Torquecap
screws8ft--lb(10.8N--m)whilecheckingforbinding
of shaft. If shaft binds as screws are tightened, add
additional shims.
C. Afterbothinputcapsareinstalled,checkendplay
of worm (input) 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 input caps and gearbox housing. Total shim
thickness at one input cap should be within 0.005”
(0.13 mm) of the total shim thickness of the other
cap.
1. Press
2. Output shaft
3. Bearing cone
4. Worm gear
Figure 21
2
3
1
4
3
1. Press
2. Output shaft
3. Worm gear
4. Bearing cone
Figure 22
2
3
1
4
6. Once correct quantity of shims has been deter-
mined, make final assembly of input caps to gearbox
housing.
A. Remove open input caps from housing.
B. Install newO--ringinto grooveofinputcap.Apply
light coat of grease on O--ring and gearbox housing
bore.
C. Taking care to not damage O--ring or shims,
install input cap over input shaft and into housing.
D. Apply Loctite #242 to cap screw threads. Install
and torque cap screws 8 ft--lb (10.8 N--m).
Drive Train
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