JLG M600 Service Manual - Manual (Page 79)

SECTION 3 - CHASSIS & TURNTABLE
3121813 – JLG Lift – 3-41
Motor Control Valve Assembly
(See Figure 3-18., Motor Control Valve Disassembly)
1. Lay assembly down with motor ports facing up.
Remove the two plastic plugs in the motor ports on
new motors, being careful not to loose the O ring in
each port. Assemble the Motor control Valve (31)
onto the Motor (10) with Bolts (34) and Washers
(33). Torque Bolts (34) to 23-27 ft-lbs.
NOTE: Be sure to align the holes in the control valve with
the motor ports and make sure o-ring is in hole.
2. Install Straight Fitting (21) into Brake Housing (6)
and torque to 13-15 ft-lbs.
3. Install Elbow Fitting (17) into Motor Control Valve
(31) with chamfered end of fitting pointing towards
straight Fitting (21). Thread fitting all the way in until
in the correct position, then torque jam nut to 13-15
ft-lbs.
4. Assemble Tubing (20) Nuts (18) and Ferrules (19)
per the procedures below.
Tube Fitting Assembly Procedures
NOTE: Be sure the tube is inline with the fitting. If required,
gently modify the tube bends to be inline.
1. Assemble nut onto tubing with threaded end toward
the assembled end of the tube.
2. Assemble ferrule onto tube with the large tapered
end into the nut.
3. Place tube tight against the flared fitting in the
assembly.
4. Lubricate threads and fitting end with hydraulic oil.
5. Slide ferrule and nut against fitting and hand tighten
nut to the fitting.
6. Mark nut in relation to the fitting.
7. Hold tube tight against fitting and tighten nut 1-1/4
turns of the nut past the marked location.
NOTE: Be sure to align the holes in the control valve with
the motor ports.
8. Pressure test brake, tube and control valve connec-
tions by applying 3000psi pressure to the brake
bleed port and holding for 1 minute. Check for leaks
at the control-valve-motor interface and the tube
connections. Release pressure.
Procedure for Setting Gear Backlash
NOTE: The bearing high spot will be marked with yellow
paint.
1. Place a shim, JLG P/N 4071009, between the pinion
and bearing high spot.
2. Torque the shoulder screw (1) to 420 ft.lbs. (588 Nm)
with Loctite #271.
3. Remove the turntable lock pin.
4. Pre-torque the 3/4 inch capscrews (2) to 120 ft.lbs.
(168 Nm) with Loctite #271.
1. Shoulder Screw
2. Capscrew
3. Setscrew
4. Jam Nut
Figure 3-24. Setting Gear Backlash