JLG 740A, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121160 – JLG Lift – 3-31
Disassembly
NOTE: Removal of the endcap voids warranty.
During assembly, coat all moving parts with a film of
clean hydraulic oil. This assures that these parts will
be lubricated during start-up.
Replace all O-Rings and gaskets.
It is recommended that all O-rings be replaced.
Lightly lubricate all O-rings with clean petroleum jelly
prior to assembly.
1. Using a 11/16 in wrench remove plug (1) and (2).
2. Using a 5/8 in 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 the unit. Discard any O-rings
on the fittings.
9. Using an 11/16 inch hex wrench, loosen the speed
sensor lock nut (14) if equipped. Then remove the
speed sensor using a Vi inch hex wrench. Units with-
out speed sensor have an O-ring plug (15) installed
in that location; remove it with a Va inch internal hex
wrench.
10. Using a 1/4 inch 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 inch internal hex wrench, remove drain
plugs (19, 20). Discard O-rings.
12. Using a 9/16 inch internal hex wrench, remove work
port plugs (21, if equipped with axial ports). 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 3-13. 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 3-14. Plugs, Fittings, and Speed Sensor