SkyTrak 8042 Service Manual - Manual (Page 560)

8.145 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
IMPORTANT: Use a suitable installation tool or
compression sleeve to help prevent twisting or damaging
the seals and o-rings when installing the piston (12) and
head gland (9) into the cylinder. When sliding the rod
and piston assembly in the tube, DO NOT damage the
piston by scraping it against the threads in the tube.
Keep the rod in line with the tube to prevent binding.
14. Keep the rod (10) straight and carefully insert the rod
into the tube (2). Avoid scratching, nicking or
damaging the tube while installing the rod.
15. Begin threading the head gland (9) into the tube (2).
Place the locking insert (8) in its hole in the head
gland threads just before the hole is threaded into
the tube. Use a suitable pin spanner wrench to
thread the head gland (9) completely into the tube
(2). Torque the head gland to 300-400 lb-ft (407-542
Nm).
16. Using new oiled o-rings, thread the two pilot-operated
check valves (3), the pressure reducing valve (4) and
the five solenoid valves (5 and 6) into the manifold
block (7). Torque the five solenoid cartridges (5 and
6) to 25-30 lb-ft (34-41 Nm). Torque the check valves
(3) and the pressure reducing valve (4) to 35-40 lb-ft
(47-54 Nm). Place the solenoid coils on the
cartridges and torque the solenoid nuts to 4-6 lb-ft
(5-8 Nm).
17. Test the cylinder (1) at low operating pressure 100
psi (7 bar) to verify that the piston and rod move
freely in both directions.
18. Increase the operating pressure to the maximum for
the cylinder 4000 psi (275 bar) and check for
external leakage and for free movement in both
directions.
19. Retract the piston fully.