JLG 740AJ Service Manual - Manual (Page 302)

SECTION 5 - HYDRAULICS
5-16 – JLG Lift – 3121160
* When removing the control valve, it is important to observe the tag on the face of the valve, as the new valve must be installed with the tag facing
the same way as the tag on the valve that was removed. The bolt pattern on the directional control valve is not symmetrical, so if the bolts seem
difficult to turn when installing, it would indicate the valve is upside down, and forcing the bolts will result in cross-threading. Check the tag, and
if necessary, rotate the directional control valve 180 degrees and reinstall the bolts.
1. Block
2. Load Sensing (Main Lift)
3. Load Sensing
4. Load Sensing (Swing)
5. Load Sensing
6. Load Sensing (Main)
7. Relief Valve (Main Lift) 8. Relief Valve (Swing)
9. Orifice
10. Check Valve (Tower Lift)
11. Relief Valve (
Tower Platform Level )
12. Relief Valve (Platform Level)
13. Relief Valve ((Front Steer)
14. Relief Valve (Front Steer)
15. Pilot Check (Platform Level)
16. Control Valve (Main Lift)
17. Control Valve (Swing)
18. Control Valve (Main)
19. Flow Regulator (
Main, Options )
20. Control Valve (Main Lift)
21. Cartridge Valve (Tower Tele)
22. Seal
23. Rod Seal
24. Bleeder Valve
25. Flow Regulator
26. Control Valve (Front Steer)
27. Load Sensing Dump (Steer)
28. Load Sensing Dump
Figure 5-15. Location Of Components - Main Control Valve