JLG 600SC_660SJC Service Manual - Manual (Page 41)

SECTION 3 - CHASSIS & TURNTABLE
3121607 – JLG Lift – 3-5
TRACK SHOES
1. Visually check for loose or missing bolts at the start of
each operating shift.
2. Check bolt torque approximately every 100 hours.
Torque track shoe bolts to 65 ft-lb, +6 (91 Nm, +8.4),
then tighten 1/3 turn (120°) further.
TRACK PIN
The track pin is pressed in the right and left link of the chain. It
is also installed through bushing at each end of the link. Out-
side diameter (O.D.) of pin wears against inside diameter (I.D.)
of bushing with which it is making contact. Once pin reaches
allowable wear limit it may be rotated 180 degrees for
extended life.
TRACK BUSHING (BEARING)
Track bushings fit in the counterbore of each link. There is one
bushing per link set. The O.D. of the bushing contacts drive
sprocket teeth during travel and results in bushing wear at
sprocket side only. This wear and pin wear is a major factor in
looseness and damage to the chain by increasing pitch length.
Replace Track
REMOVE TRACK
UNCONTROLLED TRACK MOVEMENT CAN CAUSE SERIOUS INJURY. KEEP CLEAR
OF TRACK WHEN REMOVING PIN.
1. Use wood blocking, a come-along, or other device to
prevent track and chain assembly from falling uncon-
trolled to ground.
2. Remove four bolts (10), nuts (11), and track cleat (9) from
chain assembly. Repeat with adjacent track cleat.
3. Use a portable press to push pin (5) out. Remove bush-
ing (4).
LINKS, PIN, AND BUSHING WEAR MEASUREMENT
To establish average wear measurement, choose a length of 4
sections of link assembly on top of the undercarriage in a well
tensioned zone.
When wear measurement reaches 100% limit turn pins 180°
for extended life. If this operation has been previously per-
formed, worn parts must be replaced.
INSTALL TRACK
NOTE: Chain must be installed with pin end of links facing back of
machine at ground level.
1. Align chain and C-clamp spacer in two places on chain.
Hammer in chain link aligning pin hole.
2. Insert alignment pin through hole to temporarily hold
track together.
3. Position wood blocks to frame rail for tracks to lay onto
when connecting track ends to get proper extension for
connecting end links.