Initial Start-Up; Setting Swing Gear Backlash - JLG 1850SJ Service And Maintenance Manual

Initial Start-up

Follow this procedure when starting-up a new motor or when
installing a motor that has been removed.
INSPECT MOTOR FOR DAMAGE BEFORE INSTALLATION. MAKE CERTAIN ALL
SYSTEM COMPONENTS (RESERVOIR, HOSES, VALVES, FITTINGS, HEAT
EXCHANGER, ETC.) ARE CLEAN BEFORE 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.

3.12 SETTING SWING GEAR BACKLASH

Set backlash 0.10 to 0.15" (0.254 to 0.381 mm) using the fol-
lowing procedure.
1. Place machine on firm, level ground.
3121619
SECTION 3 - CHASSIS & TURNTABLE
2. Place shim between pinion and bearing on bearing high
spot.
SU R FAC E BEL OW TEETH
WITH "X" AN D BL U E PAIN T
ON TH R EE TEETH
3. Apply JLG Thread locking compound P/N 0100019 to
bolt. Torque pivot spacer screw to 340 ft-lb (47 kgm).
NOTE: Make sure turntable is properly supported during the fol-
lowing step. The turntable can swing a few degrees when
turntable lock is removed if turntable is not balanced.
4. Remove turntable lock pin.
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