JLG 450A_AJ Series II Service Manual - Manual (Page 100)

SECTION 3 - CHASSIS & TURNTABLE
3-50 – JLG Lift – 3121180
Disassembly
NOTE: Removal of endcap voids warranty.
During assembly, coat all moving parts with a film of
clean hydraulic oil. This ensures parts are lubri-
cated during start-up.
Replace all O-Rings and gaskets. Lightly lubricate
O-rings with clean petroleum jelly prior to assembly.
1. Using a 11/16" wrench, remove plug (1) and (2).
2. Using a 5/8" hex wrench, remove plug (3).
3. Remove O-rings (4, 5, and 6).
4. Using pliers, remove centering springs (7, 8, and 9).
5. Remove spring retaining washers (10 and 11).
6. Remove shift spool (12).
7. Remove orifice poppet (13).
8. Remove all fittings from unit. Discard O-rings.
9. Using an 11/16" hex wrench, loosen speed sensor
lock nut (14) if equipped and remove speed sensor.
Units without speed sensor have an O-ring plug (15)
installed in that location; remove it with a
1/4" inch
internal hex wrench.
10. Using a 1/4" internal hex wrench, remove control line
plugs (16, 17). Discard O-rings. Using a 3 mm hex
wrench, remove cavity plug (18) (if equipped with
two-line control), from X2 cavity.
11. Using a 5/16" internal hex wrench, remove drain
plugs (19, 20). Discard O-rings.
12. If equipped with axial ports, use a 9/16" an internal
hex wrench and remove work port plugs (21). Discard
O-rings.
5
3
7
13
2
6
9
11
1
4
8
10
12
1. Plug
2. Plug
3. Plug
4. O-ring 5. O-ring
6. O-ring
7. Spring
8. Spring 9. Spring
10. Washer
11. Washer 12. Shift Spool
13. Orifice Poppet
Figure 3-27. Loop Flushing Spool
15
20
16
16
19
17
18
21
14
14. Lock Nut
15. O-ring Plug
16. Control Line Plug
17. Control Line Plug 18. Cavity Plug
19. Drain Plug
20. Drain Plug
21. Work Port Plug
Figure 3-28. Plugs, Fittings, and Speed Sensor