JLG 600SC_660SJC Service Manual - Manual (Page 125)

SECTION 6 - UNDERCARRIAGE
3120898 – JLG Lift – 6-21
3. Lower the temperature of bushings (7), and install
one in each side of the front idler with a press.
4. Temporarily install a bearing (2) on shaft (4). Install
the shaft in the front idler. Install the other bearing (2)
on the shaft. The shaft end play must be 0.002 inch
(0.06 mm) to 0.042 inch (1.06 mm). Remove two
bearings (2) and shaft (4) from the front idler.
NOTE: The rubber seals and all of the surfaces that make
contact with the seals must be clean and dry. After
installation of the seals, put clean SAE30 oil on the
contact surfaces of the metal seals.
5. Install a Duo-cone seal kit (6) in each side of the idler
with tooling (A).
6. Install a Duo-cone seal kit (3) in each bearing (2)
with tooling (A).
7. Replace o-ring seals (5) that are used on shaft (4)
with new o-ring seals.
8. Install two o-ring seals (5) on shaft (4). Put clean
SAE 30 oil on the o-ring seals.
9. Check the condition of spring pins (1) that are used
to hold bearings (2) to shaft (4). If the spring pins are
worn or damaged, use new parts for replacement.
10. Install shaft (4) in either bearing (2). Be sure that the
spring pin hole in the shaft is aligned with the spring
pin hole in the bearing. Make sure that the marking
"R" and the milled surface of the shaft is toward the
rear of the bearing.