JLG 80HX_HX+6_HXER Service Manual - Manual (Page 81)

SECTION 2 - PROCEDURES
3120863 – JLG Lift – 2-59
6. Remove stack assembly, consisting of shaft (4),
return plate (8), and friction discs (22), from housing
(7).
7. Remove dowel pins (17), springs (5,6) and spring
guide (16) from housing (7).
8. Remove retaining ring (3) from housing (7).
9. Remove shaft by pressing or using a soft mallet on
male end of shaft (4).
10. Remove retaining ring (15) and bearing (2) from
shaft (4).
11. Press rotary oil seal (1) from housing (7).
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 re-used 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. Clean all parts thoroughly before assembly.
2. Press new rotary oil seal (1) into housing (7). Note
direction of seal.
3. Install new bearing (2) and retaining ring (15) on
shaft (4).
4. Insert shaft assembly and retaining ring (3) in hous-
ing (7).
5. Insert dowel pins (17), spring guide (16) and springs
(5,6) in housing (7) as shown in Figure 2-36., Spring
Loading.
6. Position new large diameter return plate (8) in hous-
ing with tab guided by dowel pins (17) until disc
rests on springs (5,6).
STATORS (23) AND FRICTION DISCS (22) SHOULD REMAIN DRY
DURING INSTALLATION. NO OIL RESIDUE SHOULD BE ALLOWED
TO CONTAMINATE DISC SURFACES.
7. Place a new friction disc (22) on shaft (4) until it con-
tacts return plate (8).
8. Add additional new discs (23) and new friction discs
(22) as required to complete assembly.
9. Insert separators (10) in holes of return plate (8).
10. Install new o-ring (19), new back-up ring (18), new o-
ring (21) and new back-up ring (20) on piston (24).
Note order of o-rings and back-up rings. Insert pis-
ton (24) into end cover (13) being careful not to
shear o-rings or back-up rings.
11. Install new case seal (11) in housing (7) then install
bleeder screw (14) in end cover (13).
12. Position end cover (13) on housing (7) aligning
dowel pins (17) with holes in end cover.
Figure 2-36. Spring Loading