JLG G12-55A Service Manual - Manual (Page 100)

Transmission
6-8 G10-55A, G12-55A
6.5.2 Thermal By-Pass Valve
Cartridge Installation
1. Remove the plug and install the new cartridge (12) in
the thermal by-pass valve (11).
2. Uncap and connect previously labeled transmission
oil cooler hoses (10) to thermal by-pass valve.
3. Clean transmission oil filter mounting surface.
4. Apply a thin film of clean hydraulic oil to new
transmission filter gasket. Install new filter and
torque to 20-25 lb-ft (27-34 Nm).
5. Fill the transmission. Refer to Section 2.5, “Fluids
and Lubricant Capacities,” for proper capacity.
6. Properly connect batteries.
Note: Check transmission oil level with engine at idle
and transmission oil cold.
7. Apply park brake, shift transmission control lever to
(N) NEUTRAL position and lower the forks or
attachment to ground.
8. Open engine cover.
9. Remove transmission dipstick (5) and check oil level.
Oil level should be at MAX line. Add oil as required.
10. Replace transmission dipstick.
11. Close and secure engine cover.
12. Recheck all drain plugs, lines, connections, etc., for
leaks, and tighten where necessary.
6.6 TORQUE CONVERTOR DIAPHRAGM
6.6.1 Torque Convertor Diaphragm Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the transmission control lever in the (N)
NEUTRAL position, engage the parking brake, and
shut the engine OFF.
Note: In order to remove engine drive plates, engine
and transmission must be separated.
2. Refer to Section 6.4.1, “Transmission Removal,” or
Section 7.7.1, “Engine Removal.”
3. Remove four bolts holding diaphragms to flywheel.
4. With drive plates and torque converter removed,
loosen and remove four bolts (7) and eight lock
washers holding the two diaphragms (8) to the
torque converter (9).
5. Replace both diaphragms if damaged.
6.6.2 Torque Convertor
Diaphragm Installation
1. Install two new diaphragms on torque converter and
install the four bolts with lock washers.
2. Mount the diaphragm/converter assembly to
the transmission.
3. Refer to Section 6.4.3, “Transmission Installation,” or
Section 7.7.2, “Engine Installation,” for the remainder
of the installation.
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9 8