JLG 660SJ Service Manual - Manual (Page 99)

SECTION 3 - CHASSIS & TURNTABLE
3120840 – JLG Lift – 3-49
9. Remove shaft by pressing or using a soft mallet on
male end of shaft (51).
10. Remove retaining ring (54) bearing (2) from shaft
(51).
11. Press rotary seal (1) from housing (51).
Inspection
1. Clean all parts thoroughly.
2. Closely inspect all parts for excessive wear, cracks
and chips. Replace parts as necessary.
3. Discard seals and o-rings.
4. Closely inspect bearings and bearing contact sur-
faces. Replace as necessary.
NOTE: Bearings may be reused if, after thorough inspec-
tion, they are found to be in good condition.
Assembly
NOTE: Lubricate all seals and o-rings with clean hydraulic
oil prior to assembly.
1. Press new rotary seal (1) into housing (52). Note the
direction of seal.
2. Install new bearing (2) on shaft (51).
3. Install shaft assembly and retaining ring (3) into
housing (52).
4. Install dowel pins (15), spring retainer (55), and
springs (5 & 6) into housing (52).
NOTE: Be sure to use the same number of springs and
spring pattern as recorded during disassembly.
5. Position new large diameter return plate (8) in hous-
ing with tabs guided by dowel pins (15) until disc
rests on springs (5 & 6).
NOTE: Discs (21 & 8) and friction discs (20) should remain
dry during installation. Oil will contaminate disc sur-
faces.
6. Place new disc (20) on shaft (51) until it contacts
return plate (8).
7. Add additional discs (21) as required to complete
assembly.
8. Insert separators (10) in holes of return plate (8).
9. Install new o-ring (17), new back-up ring (16), new o-
ring (19) and new back-up ring (18) on piston (22).
Insert piston (22) into end cover (13), being careful
not to shear o-rings or back-up rings.
10. Install new case seal (11) in housing (52), then
install bleeder screw (14) in end cover.
11. Position end cover (13) on housing (52), aligning
dowel pins (15) with holes in end cover.
Insert capscrews (12) and tighten evenly to draw end
cover (13) to housing (52). Torque capscrews to 75 Nm.
3.13 TILT ALARM SWITCH (MACHINES W/
EXTERNAL TILT
PERFORM TILT ALARM SWITCH LEVELING PROCEDURE A MINI-
MUM OF EVERY SIX MONTHS TO ENSURE PROPER OPERATION
AND ADJUSTMENT OF SWITCH.
Manual Adjustment
1. Park the machine on a flat, level surface. Ensure
machine is level and tires are filled to rated pressure.
NOTE: Ensure switch mounting bracket is level and
securely attached.
2. Level the base of the indicator by tightening the
three flange nuts through approximately one quarter
of its spring travel. DO NOT ADJUST THE “X” NUT
DURING THE REMAINDER OF THE PROCEDURE.
3. With the electrical connections complete, using bub-
ble level on top of indicator, slowly tighten or loosen
the three flange nuts until indicator is level.
4. Individually push down on one corner at a time;
there should be enough travel to cause the switch to
trip. If the switch does not trip in all three tests, the
flange nuts have been tightened too far. Loosen the
“X” nut and repeat steps (2). through (4).
Figure 3-32. Tilt Switch Adjustment