JLG G12-55A Service Manual - Manual (Page 91)

6-3 G10-55A, G12-55A
Transmission
6.2 TRANSMISSION SERIAL NUMBER
The transmission serial number plate (1) is located on the
front of the transmission case behind the oil dipstick.
Information on the serial number plate is required in
correspondence regarding the transmission.
6.3 TRANSMISSION SPECIFICATIONS
AND MAINTENANCE INFORMATION
For transmission, oil specifications and maintenance
information, refer to Section 2, “General Information and
Specifications.”
Detailed transmission service instructions are provided in
the following publications:
• Service Manual (P/N 31200241)
• Parts Manual (P/N 31200257)
6.4 TRANSMISSION REPLACEMENT
Note: Contact the local distributor if internal
transmission repair is required during the warranty
period.
Note: Cleanliness is of extreme importance. Before
attempting to remove the transmission, thoroughly clean
the exterior of the transmission to help prevent dirt from
entering during the replacement process. Avoid spraying
water or cleaning solution onto or near the transmission
shift solenoids and other electrical components.
6.4.1 Transmission 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 (N)
NEUTRAL, engage the park brake and shut the
engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel, stating that the machine
should not be operated.
3. Open the engine cover. Allow the system fluids to cool.
4. Remove engine cover to allow easier access to the
transmission.
5. Drain the hydraulic oil reservoir. Refer to Section
8.5.1, “Hydraulic Oil Reservoir Draining.”
6. Properly disconnect the battery.
7. Thoroughly clean the transmission and surrounding
area, including all hoses and fittings, before
proceeding.
8. Place a suitable receptacle under the transmission
drain plug (2). Remove the transmission drain plug,
and allow the transmission oil to drain into the
receptacle. Repeat drain procedure with the drop
box (3).
WARNING
DO NOT service the machine without following all
safety precautions as outlined in Section 1, “Safety
Practices,” of this manual.
MY0990
1
WARNING
NEVER lift a transmission alone; enlist the help of at
least one assistant or use a suitable hoist or overhead
crane and sling with a minimum lifting capacity of
1000 lb (454 kg).
MY0980
2 3