Traction Pump Trunnion Seal Replacement (Fig. 18)
Hydraulic System
Figure 18
1. Park the machine on a level surface, lower cutting
units, en
gage parking brake and stop the engine.
2. Remove control linkage from swashplate control shaft
on transmission (see Transmission Control Removal).
3. Remove hex tapping screws (Item 16) retaining trun-
nion seal cover (Item 35) to transmission housing.
4. Remove trunnion seal cover with lip seal (Item 34)
and o-ring (Item 18).
5. Put seal cover in an arbor press and press out old
seal. Once removed, the seal is not reusable.
6. Inspect seal cover for damage. Inspect sealing area
on
shaft for rust, wear, or contamination. Polish sealing
area on shaft if necessary.
7. Using an arbor press, press seal into position from
in
side of seal cover until it bottoms out in its bore. Be
careful not to damage the seal.
8. Install o-ring onto seal cover and retain with petro-
le
um jelly.
9. Use a seal installer tool or wrap end of swashplate
control shaft with thin plastic to prevent damage to seal
during installation.
10. Slide seal cover assembly over swashplate control
s
haft onto housing. Install hex tapping screws and
tighten to a torque of 6 to 9 ft-lbs.
11. Install control linkage onto transmission. Check
ma
chine for “creeping” when engine is running with foot
pedal in neutral position. Do Traction Control Neutral
Adjustment if necessary.
Groundsmaster
®
455-D Page 4 - 29 Repairs
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