Boom Elevation Proximity Switch; Description; Fig. 7-22: Boom Elevation Proximity Switch - JLG Lull 1044C-54 II Series Service Manual

Solenoid Valve
Check Valve

Boom Elevation Proximity Switch

Description

31200079
9. Install two (2) backup rings and O-ring on each pilot piston (Item 14) so
O-ring is between backup rings. (Ref. Fig. 7-21).
10. Lubricate backup rings and O-ring on each pilot piston and install
pistons in block body. Tapered end of pistons must face out as shown
in Fig. 7-21.
11. Install large O-ring , O-ring , and backup ring on each check valve
cartridge (Item 13).
12. Lubricate O-rings and backup ring on each check valve cartridge (Item
13). Install cartridges and torque to 45–50 ft-lbs (540–600 in-lbs).
13. Install check valve in SYS port and torque to 46–50 ft-lbs.
14. Install adjustable fitting in T port. Position fitting as previously noted
and torque to 300–340 in-lbs (25–29 ft-lbs).
15. Two (2) O-rings (Item 8) are installed when control block is installed on
rear oscillation lock cylinder. See "Installation" on page 7-34.

Fig. 7-22: Boom Elevation Proximity Switch

(Ref. Fig. 7-22) The boom elevation proximity switch is located on the left
side of the transfer carriage/boom cradle. This normally open switch
closes when the boom is below 20° elevation. This normally open switch
closes when the boom is below 40° elevation.The switch is a component of
the rear oscillation lock system. See "Rear Oscillation Lock System" on
page 7-17.
Frame Tilt and Oscillation
Boom
Proximity Switch
Transfer Carriage/Boom Cradle
7-37