JLG G6-42A Service Manual - Manual (Page 110)

Transmission
6-8 G6-42A, G9-43A, G10-43A
6.6 TRANSMISSION COOLER THERMAL
BYPASS VALVE
6.6.1 Thermal Bypass Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the travel select lever in the (N) NEUTRAL
position, engage the parking brake, and shut the
engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel.
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect and remove the battery.
5. Place a suitable container under the transmission
drain plug (1). Remove the transmission drain plug,
and allow the transmission oil to drain into the
receptacle. Repeat drain procedure with the drop
box (2).
6. 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 and drop
box drain plugs.
7. Remove the transmission oil filter (3) and dispose of
properly. Clean the filter mounting surface. Cover or
cap the oil filter mount.
8. Place a suitable container beneath the transmission
cooler fittings on the hydraulic cooler. Transfer any
transmission oil into a properly labeled container.
Dispose of properly.
9. Label, disconnect and cap both transmission cooler
hoses at the radiator. Cap all fittings and openings to
prevent dirt and debris from entering.
10. Label, disconnect and cap the hoses (4) at the
thermal bypass valve (5). Cap all fittings and
openings to prevent dirt and debris from entering.
11. Loosen and remove the two bolts (6) securing the
thermal bypass valve.
12. Remove the thermal bypass valve.
MY0980
1
2
MAL1410
5
4
6
3
NOTE: ITEMS REMOVED FROM ILLUSTRATION FOR CLARITY