JLG G6-23A Service Manual - Manual (Page 57)

6.3 G5-19A, G6-23A
Transmission:
6.2 TRANSMISSION DESCRIPTION
Instructions in this section pertain mainly to general
specifications, towing, maintenance information, and
transmission removal and installation procedures. For
internal transmission service instructions and detailed
specifications contact your local JLG distributor for a copy
of the Rexroth Repair Manual (P/N 31200124).
More information can be obtained from the serial number
plate directly mounted on the transmission. Information
specified on the serial number plate includes the
transmission model number, the transmission serial
number and other data. Information on the serial number
plate is required in correspondence regarding the
transmission.
6.3 TRANSMISSION SPECIFICATIONS
6.3.1 Transmission Maintenance
The transmission is a hydraulic component and requires
the same maintenance as the hydraulic system. Refer to
Section 2.5, “Maintenance Schedules.”
Performance criteria is based on full throttle engine
speed unless otherwise specified or not applicable.
Travel Speed (no load)
G5-19A (with 405/70-20 tires)
First gear .............................................. 6 mph (10 km/hr)
Second gear ...................................... 21 mph (34 km/hr)
G6-23A (with 405/70-24 tires)
First gear ............................................... 4 mph (7 km/hr)
Second gear ...................................... 20 mph (33 km/hr)
6.4 TRANSMISSION REPLACEMENT
Note: Contact your local JLG distributor if internal
transmission repair is required during the warranty
period.
IMPORTANT: To help ensure safety and optimum
performance, replace the transmission if it is damaged.
Refer to the appropriate parts manual for ordering
information.
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, fully
retract the boom, lower the boom, place the
transmission control lever in (N) NEUTRAL, turn rear
wheels to give easier access to rear of engine
compartment, engage the park brake and shut the
engine OFF.
2. Place an 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. Disconnect the battery negative (-) cable at the
battery negative (-) terminal.
5. Remove battery from engine compartment,
disconnect and remove battery tray.
6. Remove access panel in rear of engine
compartment.
7. Remove belly pan of engine compartment.
8. Drain the hydraulic oil reservoir. Refer to Section
8.7.1, “Hydraulic Oil Reservoir Draining.”
9. Label, disconnect and cap all hydraulic hoses
attached to transmission, cap all fittings and
openings to keep dirt & debris from entering
hydraulic system.
10. Label and disconnect all electrical connections
attached to the transmission.
11. Wipe up any spilled hydraulic and transmission oil.
12. Vertically secure transmission with a lifting strap or
chain. Use a suitable hoist or overhead crane.
Operate the hoist or crane to remove slack from the
WARNING:
DO NOT service the
machine without following all safety
precautions as outlined in Section 1, “Safety
Practices,” of this manual. Failure to follow the
safety practices may result in death or serious
injury.