JLG G12-55A Service Manual - Manual (Page 99)

6-7 G10-55A, G12-55A
Transmission
6.5 TRANSMISSION COOLER THERMAL
BY-PASS VALVE
6.5.1 Thermal By-Pass Valve
Cartridge Removal
1. Park machine on a firm, level surface, level machine,
fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL position, engage
parking brake, and shut engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel.
3. Open engine cover. Allow system fluids to cool.
4. Properly disconnect the batteries.
5. Thoroughly clean the transmission and surrounding
area, including all the hoses and fittings,
before proceeding.
6. Place a suitable receptacle under transmission drain
cock (7). Open transmission drain cock, and allow
transmission oil to drain into receptacle. Remove
drain plug and repeat drain procedure with the drop
box (8).
7. Transfer used transmission oil into a suitable,
covered container, and label container as “Used Oil.”
Dispose of used oil at an approved recycling facility.
Close the transmission drain cock. Clean and
reinstall the drop box drain plug.
8. Remove transmission oil filter (9) and dispose of
properly. Clean filter mounting surface. Cover or cap
oil filter mount.
9. Transfer used transmission oil into a suitable,
covered container, and label container as “Used Oil.”
Dispose of used oil at an approved recycling facility.
Clean and reinstall the transmission and drop box
drain plugs.
10. Place a suitable container beneath transmission
cooler fittings on hydraulic cooler. Transfer any
transmission oil into a properly labeled container.
Dispose of properly.
11. Label, disconnect and cap the transmission oil
cooler hoses (10) at the thermal by-pass valve (11).
Cap all fittings and openings to prevent dirt and
debris from entering.
12. Loosen and remove the cartridge (12) from side of
thermal by-pass valve. Plug opening to prevent dirt
and debris from entering system.
MY6971
7
8
9
MAL2180
10
12 11