JLG 450A II Series, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121290 – JLG Lift – 3-23
Disassembly
NOTE:
Removal of endcap voids warranty.
During assembly, coat all moving parts with a film of
clean hydraulic oil. This ensures parts are lubricated dur-
ing 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 3-9. 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 3-10. Plugs, Fittings, and Speed Sensor