JLG 1850SJ Service Manual - Manual (Page 186)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-16 – JLG Lift – 3121619
9. Thread piston on cylinder rod hand tight. Ensure O-ring
and back-up rings are not damaged or dislodged.
NOTE: When installing the tapered bushing, piston and mating
end of rod must be free of oil.
10. Assemble the tapered bushing loosely into the piston
and insert capscrews through the drilled holes in the
bushing and into the tapped holes in the piston.
11. Tighten the capscrews evenly and progressively in rota-
tion to 9 ft.lbs. (12 Nm).
12. After the screws have been torqued, tap the tapered
bushing with a hammer (16 to 24 oz.) and brass shaft
(approximately 3/4" in diameter) as follows;
a. Place the shaft against the cylinder rod and in con-
tact with the bushing in the spaces between the
capscrews.
b. Tap each space once; this means the tapered bush-
ing is tapped 3 times as there are 3 spaces between
the capscrews.
13. Retorque the capscrews evenly and progressively in
rotation to 9 ft.lbs. (12 Nm).
INSERTING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL
SURFACES. USE EXTREME CARE WHEN INSTALLING C YLINDER ROD, HEAD,
AND PISTON.
14. Clamp barrel securely and support rod. Insert piston end
into barrel cylinder. Do not damage or dislodge piston
O-ring and seal ring.
15. Continue pushing rod in barrel until cylinder head can
be inserted into barrel cylinder.
NOTE: Apply locking primer and JLG Threadlocker (P/N 0100011)
to capscrews.
16. Secure cylinder head and washer ring with eight cap-
screws.
17. Install two counterbalance valves with new O-rings in
valve block. Torque to 30-35 ft-lb (40-47 Nm).
Figure 5-18. Tapered Bushing Installation
Figure 5-19. Seating the Tapered Bearing
Figure 5-20. Rod Assembly Installation