JLG Skytrak 6036 Service Manual page 162

2. Install new O-ring (3) in inlet section (2).
3. Install tie rods (9 and 10) from the outside of
inlet section (2) through the holes in the inlet
section.
4. Install boom hoist section (4) over tie rods (9
and 10)
5. Repeat steps 2 thru 4 for the remaining valve
sections (5 thru 8).
6. Install check valve poppet (12) and spring (11)
into frame tilt section.
7. Install nuts (1 and 13) on the ends of the tie
rods (9 and 10) and tighten the nuts so the
rods protrude the same amount from both
sides of the valve. Torque nuts (1) to 48 ± 4.8
lb-ft (65 ± 6,5 N m). Torque nuts (13) to 75 ±
7.5 lb-ft (102 ± 10 N m).
d. Repair of Main Control Valve Sections
When repairing the main control valve, first refer to
paragraph b and repair the relief valveds. It might
be advisable to install seal and spring (repair) kits
in all of the relief valves at this time.
Disassembly
1. Remove two socket head capscrews (1, Fig.
9.27) and spool cap (2).
2. Remove spool end (3), spring seat (4), spring
(5), spring end (4), wiper (6) and O-ring (7).
3. Remove two round head machine screws (10),
seal plate (9), wiper (6), and O-ring (7).
Cleaning and Drying
Clean all metal parts in an approved solvent such
as trichlorethylene and blow dry.
Inspection and Replacement
1. Inspect spool seating surfaces. They must be
sharp, clean, and free of nicks or excessive
wear. Replace entire section if worn or
damaged.
2. Replace all O-rings and backup rings with new
ones. Repair kits are available.
3. Make sure the piston moves freely in valve
section.
Assembly
1. Insert spool in the linkage end of the section.
IMPORTANT. Take care during insertion to avoid
damaging the valve's internal lands.
2. Install O-ring (7, Fig. 9.27), wiper (6) and seal
plate (9) and secure with two round head
screws (10).
9-49
Section 9. Hydraulic System
1
8
7
6
9
10
1. Hex Socket Capscrew (2)
2. Spool Cap
3. Spool End
4. Spring Seat
5. Spring
6. Wiper
7. O-ring
8. Section Body with Spool (body and spool
supplied only as a complete assembly)
9. Seal Plate
10. Round Head Screw (2)
Figure 9.27 Valve Section Exploded View
3. Install O-ring (7), spool end (3), spool cap (2)
and secure with socket head capscrews (1).
e. Main Control Valve Installation
1. Position the main control valve (6, Fig. 9.23)
on the forklift and secure it to frame using
capscrews (5), locknuts (3), and washers (4).
2. Install control linkage (7) using retaining pins
(2) and cotter pins (1).
3. Connect hydraulic lines to control valve.
Model 6036 S/N 9B0499 and Before
2
3
4
5
4
6
7
MA0681