Service Manual Instruction Manual

SECTION 5 - HYDRAULICS
5-50 – JLG Lift – 3121616
6. If applicable, place new O-ring and back-up rings in
inner piston diameter groove.
Figure 5-109. Piston Seal Kit Installation
7. Using suitable protection, clamp cylinder rod in a vise or
similar holding fixture as close to piston as possible.
8. Carefully thread piston on cylinder rod hand tight,
Ensure O-ring and back-up rings are not damaged or
dislodged.
NOTE: Piston and mating end of rod must be free of oil when
installing tapered bushing.
9. Thread piston onto rod until it aligns with spacer end
and install tapered bushing.
NOTE: Apply JLG Medium-Strength (Blue) Thread Locking Com-
pound P/N 010011 or equivalent to tapered bushing bolts
when rebuilding master, slave, lift, and telescope cylinders.
10. Install bolts in tapered bushing using JLG Medium-
Strength (Blue) Thread Locking Compound P/N 010011
Figure 5-110. Tapered Bushing Installation
11. Remove cylinder rod from holding fixture.
12. Place new guide locks and seals in applicable outside
diameter grooves of cylinder piston.
13. Position cylinder barrel in a suitable holding fixture.
INSERTING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL
SURFACES. USE EXTREME CARE WHEN INSTALLING CYLINDER ROD, HEAD,
AND PISTON.
14. Clamp barrel clamped securely and support rod. Insert
piston end into barrel cylinder. Do not damage or dis-
lodge piston loading O-ring and seal ring.
15. Continue pushing rod into barrel until cylinder head
gland can be inserted into barrel cylinder.
16. Secure cylinder head gland using washer ring and
socket head bolts.
Figure 5-111. Rod Assembly Installation
Piston
Guide Lock Ring
Back-Up Rings
O-Ring
Guide Lock Ring
Seal
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