JLG G12-55A Service Manual - Manual (Page 92)

Transmission
6-4 G10-55A, G12-55A
9. Transfer the used transmission oil into a suitable,
covered container, and label the container as “Used
Oil.” Dispose of used oil at an approved recycling
facility. Clean and reinstall the transmission drain
plug.
10. Remove the transmission-to-axle drive shafts. Refer
to Section 5.4.3, “Drive Shaft Removal.”
11. Remove air cleaner unit and intake tubes.
12. Remove the hydraulic pump. Refer to Section 8.6.1,
“Implement Pump Replacement.”
13. Label and disconnect the transmission temperature
switch connector and shift solenoid wiring harness
connectors.
14. Label, disconnect and cap the transmission oil
cooler inlet and outlet hoses at the transmission.
15. Remove the access plug from side of the engine bell
housing. This will allow access to remove the four
bolts holding the torque convertor diaphragm to the
engine flywheel.
16. Turn the engine over slowly by hand and align each
of the four torque convertor diaphragm bolts to be
accessed. Remove them one at a time.
17. Wipe up any spilled hydraulic and transmission oil.
18. Connect a lifting strap or chain to the lifting eye at
the top of the transmission, and to a suitable hoist or
overhead crane. Operate the hoist or crane to
remove slack from the chain, but DO NOT raise the
transmission at this time.
19. Place blocks under rear of engine for support
BEFORE transmission mounts are removed.
20. Place blocks under the transmission to help support
it during removal.
21. Remove both rear transmission mount bolts and
lockwashers securing the transmission mount to the
frame.
22. Remove the bolts and washers holding the
transmission to the engine.
23. Remove the capscrews and lockwashers securing
each rear transmission mount to the transmission.
24. Carefully remove the transmission from the
machine. Avoid causing damage to the transmission
or surrounding parts.
25. Lift the transmission clear of the machine, and lower
it onto suitable supports or secure it to a stand built
especially for transmission or engine service. Secure
the transmission so that it will not move or fall.
26. Remove any external transmission components as
required, including the transmission temperature
switch, and inlet and outlet cooler hose fittings.
Cover all transmission openings.
27. Remove the transmission oil filter (4) and dispose of
properly. Clean the filter mounting surface. Cover or
cap the oil filter mount.
28. If transmission oil is suspect to contamination or
torque converter is damaged, remove the converter
and flex plate from the transmission.
29. Remove the bolt and washers holding the converter
to the flex plate.
6.4.2 Transmission Inspection and Internal
Repair
If replacing the entire transmission, transfer the
transmission temperature switch to the replacement
transmission. The gear shift solenoids are included with a
new transmission.
MY0990
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