JLG 4394RT Service Manual - Manual (Page 58)

SECTION 3 - CHASSIS & SCISSOR ARMS
3-22 – JLG Sizzor – 3121133
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