JLG 26MRT ANSI Service Manual - Manual (Page 38)

SECTION 2 - PROCEDURES
2-26 – JLG Sizzor – 3120791
IF HYDROSTATIC BENCH TESTING IS PERFORMED ON THE
BRAKE ASSEMBLY, RELEASE PRESSURE SHOULD NOT EXCEED
1,000 PSI (69 BAR) UNLESS FOUR ADDITIONAL BOLTS ARE
USED FOR SUPPLEMENTAL CLAMPING.
2.17 THROTTLE CHECKS AND
ADJUSTMENTS
Gasoline Engine
1. Open the engine hood to gain access to the RPM
adjustments.
2. Disconnect the wire harness from the ADDCO throt-
tle and install JLG wire harness #4921850 to the
ADDCO and the engine harness as shown in Figure
8-24 Start the engine and allow it to come up to
operating temperature. Adjust the IDLE #1 engine
pot on the ADDCO CW to retract the actuator (lower)
or CCW to extend the actuator (higher) until IDLE
engine runs at 1500 RPM.
3. Position toggle switch to MID engine. Adjust the MID
#2 engine pot on the ADDCO CW to retract the
actuator (lower) or CCW to extend the actuator
(higher) until MID engine runs at 2000 RPM.
4. Position toggle switch to HIGH engine. Adjust the
HIGH #3 engine pot on the ADDCO CW to retract
the actuator (lower) or CCW to extend the actuator
(higher) until HIGH engine runs at 3000 RPM.
NOTE: Actuator cable travel must stop slightly before the
lever makes contact with the throttle lever stop. Fail-
ure to do so will burn out the actuator.
5. Remove the adjustment harness from the ADDCO
and the engine harness and re-connect the engine
harness to the ADDCO.
Diesel Engine
NOTE: Never run the fuel tank dry. Diesel engines cannot be
restarted after running out of fuel until the fuel sys-
tem has been air-vented or ‘bled’ of air. See the Yan-
mar Instruction Manual for the proper procedure.
1. Open the engine hood to gain access to the RPM
adjustments.
2. Disconnect the wire harness from the ADDCO throt-
tle and install JLG wire harness #4921850 to the
ADDCO and the engine harness as shown in Figure
8-24 Start the engine and allow it to come up to
operating temperature. Adjust the IDLE screw CW
(higher) or CCW (lower) until IDLE speed is 1200
RPM.
3. Position toggle switch to MID engine. Adjust the MID
#1 engine pot on the ADDCO CW to retract the
actuator (lower) or CCW to extend the actuator
(higher) until MID engine runs at 2000 RPM.
4. Position toggle switch to HIGH engine. Adjust the
HIGH #2 engine pot on the ADDCO CW to retract
the actuator (lower) or CCW to extend the actuator
(higher) until HIGH engine runs at 3000 RPM.
NOTE: Actuator cable travel must stop slightly before the
lever makes contact with the throttle lever stop. Fail-
ure to do so will burn out the actuator.
5. Remove the adjustment harness from the ADDCO
and the engine harness and re-connect the engine
harness to the ADDCO.
2.18 CONTROL CARD SETUP AND TEST
PROCEDURES
Valve Driver Card Setup
Before starting this procedure, all hydraulic relief pressure
settings and engine RPM settings should be set, and the
engine warmed to operating temperature. Refer to Figure
2-23., Valve Driver Card
The following tools will be required to perform the setup
procedure: a small straight screwdriver, a voltmeter, and
an ammeter with at least a 2 amp capacity.
The valve driver card LED indications are as follows:
LED1 - RANGE*
LED2 - RANGE*
LED3 - OUTPUT ON
LED4 - POWER GOOD
* RANGE Indications
LED1 ON, LED2 ON - 100%
LED1 OFF, LED2 ON - 67%
LED1 ON, LED2 OFF - 45%
LED1 OFF, LED2 OFF - OFF