JLG 500RTS ANSI Service Manual - Manual (Page 28)

SECTION 2 - PROCEDURES
2-12 – JLG Sizzor – 3121103
2.15 THROTTLE CHECKS AND ADJUSTMENTS
- FORD ENGINE
Throttle Checks
12. 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.
13. 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 all the
way out 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. Adjust
speed screw until engine runs at 3000 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. Adjust remote until
engine runs at 2200 rpm.
7. Recheck speeds. When satisfied, apply a drop of fin-
gernail polish to all trimpot screws. Replace cover.
2.16 THROTTLE CHECKS AND ADJUSTMENTS
- DEUTZ F3L1011
NOTE: Never run fuel tank dry. Diesel engines cannot be
restarted after running out of fuel until fuel system
has been air-vented or bled of air. (See Deutz Oper-
ators Manual for procedure).
1. Disconnect actuator cable from the throttle lever.
With the aid of an assistant, start the engine and
allow it to come up to operating temperature. Adjust
throttle lever stop until engine runs at 2000 rpm.
Shut down engine. Reattach actuator cable to throt-
tle lever, making sure that low engine setting
remains the same. Restart engine and check set-
tings. If necessary, adjust slide pin to contact low
engine limit switch at 2000 rpm. Shut down engine.
2. With the aid of an assistant, start engine from plat-
form and allow it to come up to operating tempera-
ture. Disconnect modular dump valve wire. Activate
HIGH ENGINE switch. Activate and Drive Controller
and hold it in full drive position. Adjust slide pin to
contact high engine limit switch at 3000 rpm. Shut
off all switches and controllers. Reconnect modular
control dump valve wire.
NOTE: Actuator cable travel must stop slightly before lever
makes contact with throttle lever stop. Failure to do
so will burn out actuator.
2.17 HYDRAULIC COMPONENT START-UP
PROCEDURES AND
RECOMMENDATIONS
From a hydrostatic component standpoint, the goal at
system start up is to put into functional operation, the
hydrostatic system in such a way as to preserve the
designed life span of the system. The following start-up
procedure should be adhered to whenever a new pump
or motor is initially installed into a machine, or a system is
restarted after either a pump or motor has been removed
and/or replaced.
THE FOLLOWING PROCEDURE MAY REQUIRE THE MACHINE TO
BE DISABLED (WHEELS RAISED OFF THE GROUND, WORK
FUNCTIONS DISCONNECTED, ETC.) WHILE PERFORMING THE
PROCEDURE IN ORDER TO PREVENT INJURY. TAKE NECES-
SARY SAFETY PRECAUTIONS BEFORE MOVING THE VEHICLE/
MACHINE.
Prior to installing the pump and/or motor, inspect the
unit(s) for damage that may have been incurred during
shipping and handling. Make certain that all system com-
ponents (reservoir, hoses, valves, fittings, heat exchanger,
etc.) are clean prior to filling with fluid.
Fill the reservoir with recommended hydraulic fluid. This
fluid should be passed through a 10 micron (nominal, no
bypass) filter prior to entering the reservoir. The use of
contaminated fluid will cause damage to the components,
which may result in unexpected vehicle/machine move-
ment.
NOTE: If a pump or motor is being replaced due to internal
damage, the remaining units (pump or motors) need
to be inspected for damage and contamination, and
the entire hydraulic system will need to be flushed
and the fluid replaced. Failure to do so may cause
considerable damage to the entire system.