JLG 4394RT Service Manual - Manual (Page 43)

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3121249 – JLG Lift – 3-7
Disconnect Mechanism
The disconnect mechanism on the torque/drive hub
allows the machine to be towed. When activated, the
mechanism disconnects the gear drive and motor.
DISENGAGING PROCEDURE:
PRIOR TO DISENGAGING, THE MACHINE MUST BE ON LEVEL
GROUND AND COMPLETELY SECURED FROM ANY MOVEMENT.
ENSURE AREA SURROUNDING THE DISCONNECT IS CLEANED
PRIOR TO OPERATION. MAKE SURE DIRT OR OTHER CONTAMI-
NANTS DO NOT ENTER THE GEAR DRIVE.
CHECK GEAR DRIVE TEMPERATURE PRIOR TO HANDLING.
GEAR DRIVE MAY BE HOT AND CAUSE INJURY IF RECENTLY
OPERATED.
For numbers in parenthesis, refer to Figure 3-4., Drive
Motor/Hub Assembly.
1. Remove the 2 Bolts (30) from the Cover (28).
2. Remove the Cover.
3. Rotate Cover to show inside diameter.
4. Press Cover sufficiently against the Shift Rod (33) to
insert the 2 Bolts at least 2-3 threads into the Cover.
The Shift Rod is now subjected to the Spring (32)
force.
5. Install the 2 Bolts (30) and tighten until they are flush
with the Cover (28) with a torque wrench to 6.3 lb-ft
(8.5 Nm).
The Sun Gear Shaft (25) and Input Shaft (26) are now dis-
connected and the machine is ready to be towed.
THE MAXIMUM GEAR DRIVE TOWING SPEED OF 72 RPM MUST
N O T B E E X C E E D E D . E N G A G E G E A R D R I V E O R S E C U R E
MACHINE WHEN MACHINE IS SEPARATED FROM THE TOWING
VEHICLE.
ENGAGING PROCEDURE:
PRIOR TO ENGAGING, THE MACHINE HAS TO BE ON LEVEL
GROUND AND COMPLETELY SECURED FROM ANY MOVEMENT.
ENSURE AREA SURROUNDING THE DISCONNECT IS CLEANED
PRIOR TO OPERATION. MAKE SURE DIRT OR OTHER CONTAMI-
NANTS DO NOT ENTER THE GEAR DRIVE.
CHECK GEAR DRIVE TEMPERATURE PRIOR TO HANDLING.
GEAR DRIVE MAY BE HOT AND CAUSE INJURY IF RECENTLY
OPERATED.
THE COVER (28) IS UNDER SPRING FORCE.
For numbers in parenthesis, refer to Figure 3-4., Drive
Motor/Hub Assembly.
1. Remove the 2 Bolts (30) from the Cover (28) evenly.
2. Remove the Cover.
3. Rotate the Cover 180° and assemble.
4. Tighten 2 Bolts (30) with a torque wrench to 6.3 lb-ft
(8.5 Nm).
5. Slightly pull the machine with the towing vehicle to
allow the spline of the Sun Gear Shaft (25) to
engage with the spline of the Input Shaft (26).
DO NOT OPERATE THE MOTOR TO OBTAIN ENGAGEMENT.
6. Check again that all bolts are tight and that all com-
ponents are returned to their original position.
The gear drive should now be reengaged and the
machine can be disconnected from the towing vehicle.
Table 3-3. Gearbox Maintenance Schedule
After 150 motor operating hours - First oil change
Weekly:
- Inspect visually
- Check for unusual noise
- Check oil level
Monthly:
- Check the tightness of all screws
and bolts
Semi-annually: - Check oil quality
Annually:
(or after 1500 motor operating
hours, whichever comes first)
- Change oil