Initial Start-Up Procedures - JLG 450A series II Service And Maintenance Manual

20. Install orifice poppet (30).
21. Install shift spool (31).
22. Install spring retaining washers on springs (32 and 33).
23. Carefully install centering springs (34, 35, and 36).
24. Install new O-rings (37, 38, and 39).
25. Using a 5/8" wrench, torque plug (40) to 20 ft-lb (27 Nm).
26. Using a 11/16" wrench, torque plugs (41 and 42) to 27 ft-
lb (37 Nm).
39
34
30
40
5/8 in
20 ft.lbs.
(27 Nm)
31
32
35
38
42
11/16 in
27 ft.lbs.
(37 Nm)
30. Orifice Poppet 34. Spring
31. Shift Spool 35. Spring
32. Spring 36. Spring
33. Spring
Figure 3-28. Loop Flushing Spool
3121290
37
36
33
41
11/16 in
27 ft.lbs.
(37 Nm)
37. O-ring 40. Plug
38. O-ring 41. Plug
39. O-ring 42. Plug
– JLG Lift –
SECTION 3 - CHASSIS & TURNTABLE

Initial Start-Up Procedures

Follow this procedure when starting up a new motor or after
reinstalling a motor.
Prior to installing motor, inspect for damage incurred during
shipping or storage. Make certain all system components (res-
ervoir, hoses, valves, fittings, heat exchanger, etc.) are clean
before filling with fluid.
1. Fill reservoir with recommended hydraulic fluid. Always
filter fluid through a 10 micron filter when pouring into
reservoir. Never reuse hydraulic fluid.
2. Fill inlet line leading from pump to reservoir. Check inlet
line for properly tightened fittings and be certain it is
free of restrictions and air leaks.
3. Fill pump and motor housing with clean hydraulic fluid.
Pour filtered oil directly into upper most case drain port.
4. Install case drain lines into upper most case drain ports
to ensure pump and motor stay filled with oil.
5. Install a 0 to 500 psi (0 to 35 bar) gauge in charge pres-
sure gauge port of pump to monitor system pressure
during start up.
6. Watch pressure gauge and run engine at lowest possible
speed until system pressure builds to normal levels
(minimum 160 psi [11 bar]). Once system pressure is
established, increase to full operating speed. If system
pressure is not maintained; shut down engine, deter-
mine cause, and take corrective action.
7. Operate hydraulic system at least fifteen minutes under
light load conditions.
8. Check and adjust control settings as necessary after
installation.
9. Shut down engine and remove pressure gauge. Replace
plug at charge pressure gauge port.
10. Check fluid level in reservoir; add clean filtered fluid if
necessary. Motor is now ready for operation.
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