JLG 4394RT Service Manual - Manual (Page 55)

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3121249 – JLG Lift – 3-19
17. Remove bearing ring (1). Disassemble spool (2).
18. Disassemble shuttle valve (1). Disassemble throttle
screw with throttle pin (2).
19. Check that there are no scratches or metal deposits
on sliding surface (1), and there is no axial play (2),
(Otherwise: Pistons must be replaced in sets).
20. Check cylinder bores, splines.
21. Check that cylinder track is free of scratches, there
are no traces of wear and no embedded foreign par-
ticles. Make sure there are no scratches on the valve
plate. (Replace ONLY in sets).
1 2
2
1