JLG 660SJ Service Manual - Manual (Page 76)

SECTION 3 - CHASSIS & TURNTABLE
3-32 – JLG Lift – 3121298
Initial Start-up Procedures
Follow this procedure when starting-up a new motor or when
installing a motor that has been removed.
Prior to installing the motor, inspect for damage incurred dur-
ing shipping. Make certain all system components (reservoir,
hoses, valves, fittings, heat exchanger, etc.) are clean prior to
filling with fluid.
1. Fill reservoir with recommended hydraulic fluid. Always
filter fluid through a 10 micron filter when pouring into
the reservoir. Never reuse hydraulic fluid.
2. Fill inlet line leading from pump to reservoir. Check inlet
line for properly tightened fittings and be certain it is
free of restrictions and air leaks.
3. Fill pump and motor housing with clean hydraulic fluid.
Pour filtered oil directly in upper most case drain port.
4. To ensure pump and motor stay filled with oil, install
case drain lines in upper most case drain ports.
5. Install a 0 to 500 psi (0 to 35 bar) gauge in charge pres-
sure gauge port of pump to monitor system pressure
during start up.
6. Watching pressure gauge and run engine at lowest pos-
sible speed until system pressure builds to normal levels
(minimum 160 psi [11 bar]). Once system pressure is
established, increase to full operating speed. If system
pressure is not maintained, shut down engine, deter-
mine cause, and take corrective action.
7. Operate hydraulic system for at least fifteen minutes
under light load conditions.
8. Check and adjust control settings as necessary after
installation.
9. Shut down engine and remove pressure gauge. Replace
plug at charge pressure gauge port.
10. Check fluid level in reservoir. Add clean filtered fluid if
necessary. Motor is now ready for operation.
3.5 OSCILLATING AXLE BLEED PROCEDURE AND
LOCKOUT TEST
Lockout Cylinder Bleeding
ENSURE MACHINE IS ON A LEVEL SURFACE, REAR WHEELS ARE BLOCKED, AND
BRAKE WIRE IS DISCONNECTED. ENSURE PLATFORM IS FULLY LOWERED AND
BOOM IS CENTERED OVER REAR AXLE BEFORE STARTING BLEED PROCEDURE.
1. Park machine on a level surface and block rear wheels.
2. Center boom over rear axle to make sure oscillation
valve in rotary coupling is activated.
3. Place suitable container under flow divider mounted on
inside of frame to catch hydraulic fluid.
4. Remove Port 11 tee fitting from flow divider. Cap fitting
and plug hose.
5. Place suitable containers under each lockout cylinder to
catch hydraulic fluid.
6. Have helper start engine from platform. Turn function
control knob speed fully counter-clockwise to Turtle
position to set drive creep mode. Activate Low Drive In
Reverse creep mode.
7. Open bleeder screw on one lockout cylinder.
NOTE: Open bleeder valve enough to get a fast stream of oil. A fast
stream of oil will exhaust air from hose and lockout cylin-
der better than a slow stream.
Figure 3-43. Bleeder Valve Location
8. Close bleeder valve when no more air in hydraulic oil.
9. Repeat on opposite lockout cylinder.
10. Shut down engine.
11. Reconnect hose and tee fitting to Port 11 on flow
divider.