JLG 40RTS Service Manual - Manual (Page 30)

SECTION 2 - PROCEDURES
2-14 – JLG Sizzor – 3120826
The inlet line leading from the reservoir to the pump
should be filled prior to start-up. Check inlet line for prop-
erly tightened fittings and make sure it is free of restric-
tions and air leaks.
Be certain to fill pump and/or motor housing with clean
hydraulic fluid prior to start-up. Fill housing by pouring fil-
tered oil into upper case drain port.
Install a 0 to 35 bar (0 to 500 psi) pressure gauge in the
charge pressure gauge port to monitor charge pressure
during start-up.
It is recommended that the external control input signal
electrical connections be disconnected at the pump con-
trol until after initial start-up. This will allow the pump to
remain in its neutral position.
“Jog” or slowly rotate prime mover until charge pressure
starts to rise. Start prime mover and run at the lowest pos-
sible RPM until charge pressure has been established.
Excess air may be bled from high pressure lines through
high pressure gauge ports.
DO NOT START PRIME MOVER UNLESS PUMP IS IN NEUTRAL
POSITION (0 DEGREES SWASHPLATE ANGLE). TAKE PRECAU-
TIONS TO PREVENT MACHINE MOVEMENT IN CASE PUMP IS
ACTUATED DURING INITIAL START-UP.
Once charge pressure has been established, increase
speed to normal operating RPM. Charge pressure should
be approximately 15.5 bar (220 psi) minimum. If charge
pressure is incorrect, shut down and determine cause for
improper pressure.
INADEQUATE CHARGE PRESSURE WILL AFFECT THE OPERA-
TOR’S ABILITY TO CONTROL THE MACHINE.
Shut down prime mover and connect external control
input signal. start prime mover, checking to be certain
pump remains in neutral. with prime mover at normal
operating speed, slowly check for forward and reverse
machine operation.
Charge pressure should remain at 15.5 bar -16.9 bar (220
psi - 240 psi) minimum during forward or reverse opera-
tion. Continue to cycle slowly between forward and
reverse for at least five minutes.
Shut down prime mover, remove gauges, and plug ports.
Check reservoir level and add fluid if necessary.
2.15 THROTTLE CHECKS AND
ADJUSTMENTS - FORD
Throttle Checks
1. Check that anti-dieseling solenoid is operating. If
solenoid is operating, an audible click should be
heard when the ignition is switched on and off.
2. Check throttle linkage for smooth operation by rotat-
ing throttle lever by hand to full throttle position, then
slowly back to idle position, feeling closely for stick-
ing or binding.
Throttle Adjustments - In Sequence
NOTE: Steps (1) and (2) are preliminary settings.
1. Remove cover from controller. With engine shut
down, turn ‘gain’ CCW as far as it will go, then turn
screw slot CW until vertical. Gain may need fine tun-
ing.
2. Turn ‘droop’ CCW as far as it will go. Then turn
screw slot CW until vertical. ‘Droop’ should not need
further adjustment.
3. Turn idle adjusting screw on carburetor CCW until
there is a gap between the screw and stop plate.
4. Start engine and allow it to come up to operating
temperature.
5. Remove wire from no. 7 connector on controller,
which will switch engine speed to HIGH. On the E-
301 controller adjust ‘high speed’ screw until engine
runs at 2800 rpm. On the E-401H controller adjust
‘main speed’ screw until engine runs at 2800 rpm.
NOTE: If engine surges, turn ‘gain’ screw one or two
degrees CCW until surging stops, no more.
6. Replace wire no. 7 connector on controller, which
will return engine to LOW speed. On the E-301 con-
troller adjust ‘low speed’ until engine runs at 2200
rpm. On the E-401H controller adjust ‘mid speed’
until engine runs at 2200 rpm.
7. Recheck speeds. When satisfied, apply a drop of fin-
gernail polish to all trimpot screws. Replace cover.