Service Manual Instruction Manual

SECTION 3 - CHASSIS & TURNTABLE
3121616 – JLG Lift – 3-29
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. While watching pressure gauge, run engine at lowest
possible 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 BLEEDING PROCEDURE AND
LOCKOUT TEST
Lockout Cylinder Bleeding
ENSURE PLATFORM IS FULLY LOWERED AND BOOM IS CENTERED OVER REAR
AXLE BEFORE STARTING BLEED PROCEDURE.
ENSURE MACHINE IS ON A LEVEL SURFACE, REAR WHEELS ARE BLOCKED, AND
BRAKE WIRE IS DISCONNECTED.
1. Make sure machine is on a level surface and rear wheels
are blocked
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 3-39. Bleeder Valve Location
8. Close bleeder valve when no more air in hydraulic oil.
9. Repeat on opposite lockout cylinder.
10. Perform oscillating axle lockout test.
11. Shut down engine.
12. Reconnect hose and tee fitting to Port 11 on flow
divider.