JLG 600SC_660SJC Service Manual - Manual (Page 167)

SECTION 6 - UNDERCARRIAGE
3120898 – JLG Lift – 6-63
Do not use a chain for pulling a disabled machine. A chain
link can break. This may cause personal injury. Use a wire
rope cable with ends that have loops or rings. Put an
observer in a safe position in order to watch the pulling
procedure. The observer can stop the procedure if the
wire rope cable starts to break. Stop pulling whenever the
towing machine moves without moving the towed
machine.
Keep the tow line angle to a minimum. Do not exceed a 30
degree angle from the straight ahead position.
Quick machine movement could overload the tow line or
the tow bar. This could cause the tow line or the tow bar to
break. Gradual, steady machine movement will be more
effective.
Normally, the towing machine should be as large as the
disabled machine. Make sure that the towing machine has
enough brake capacity, enough weight, and enough
power. The towing machine must be able to control both
machines for the grade that is involved and for the dis-
tance that is involved.
You must provide sufficient control and sufficient braking
when you are moving a disabled machine downhill. This
may require a larger towing machine or additional
machines that are connected to the rear of the disabled
machine. This will prevent the machine from rolling away
out of control.
All situation requirements cannot be listed. Minimal towing
machine capacity is required on smooth, level surfaces.
On inclines or on surfaces in poor condition, maximum
towing machine capacity is required.
Do not tow a loaded machine.
Consult your JLG Distributor for the equipment that is nec-
essary for towing a disabled machine.
Final Drive Sun Gear Removal
1. Thoroughly clean the area around the final drive.
Make sure that you also clean the track shoes that
are positioned above the final drive.
2. Drain the final drive oil into a suitable container. See
Operation and Maintenance Manual, "Final Drive Oil
- Change" for the procedure.
3. Remove sixteen cover bolts (1) and final drive cover
(3).
4. Remove sun gear (2) from the final drive.
5. Install final drive cover (3) and cover bolts (1). These
parts were removed previously.
6. Fill the final drive with clean oil, Refer to Section
6.12, Final Drive.
7. Repeat the procedure for the other final drive.
WITHOUT THE SUN GEAR IN PLACE, THE BRAKES ARE INEF-
FECTIVE. PERSONAL INJURY OR DEATH COULD RESULT. PRO-
VIDE OTHER MEANS TO HOLD OR STOP THE MACHINE.
6.15 TRACK ADJUSTMENT - ADJUST
PERSONAL INJURY OR DEATH CAN RESULT FROM GREASE
UNDER PRESSURE.
GREASE COMING OUT OF THE RELIEF VALVE UNDER PRES-
SURE CAN PENETRATE THE BODY CAUSING INJURY OR DEATH.
DO NOT WATCH THE RELIEF VALVE TO SEE IF GREASE IS
ESCAPING. WATCH THE TRACK OR TRACK ADJUSTMENT CYL-
INDER TO SEE IF THE TRACK IS BEING LOOSENED.
LOOSEN THE RELIEF VALVE ONE TURN ONLY.
IF TRACK DOES NOT LOOSEN, CLOSE THE RELIEF VALVE AND
CONTACT YOUR JLG DISTRIBUTOR.
NOTE: Keeping the track properly adjusted will increase the
service life of the track and drive components.
The track tension must be set according to the cur-
rent operating conditions. Keep the track as slack as
possible if the soil is heavy.