JLG 26MRT Service Manual User Manual

Page 38

SECTION 2 - PROCEDURES

2-26

– JLG Sizzor –

3120892

IF HYDROSTATIC BENCH TESTING IS PERFORMED ON THE
BRAKE ASSEMBLY, RELEASE PRESSURE SHOULD NOT EXCEED
69 BAR (1,000 PSI) UNLESS FOUR ADDITIONAL BOLTS ARE
USED FOR SUPPLEMENTAL CLAMPING.

2.17 THROTTLE CHECKS AND

ADJUSTMENTS

Gasoline Engine

Open the engine hood to gain access to the RPM
adjustments.

Disconnect the wire harness from the ADDCO throt-
tle and install JLG wire harness #4921850 to the
ADDCO and the engine harness, See Figure 2-21.,
ADDCO Adjustments (Gasoline/Dual Fuel Engine).
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.

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.

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.

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
system has been air-vented or ‘bled’ of air. See the
Yanmar Instruction Manual for the proper procedure.

Open the engine hood to gain access to the RPM
adjustments.

Disconnect the wire harness from the ADDCO throt-
tle and install JLG wire harness #4921850 to the
ADDCO and the engine harness, See Figure 2-22.,
ADDCO Adjustments (Diesel Engine). Start the
engine and allow it to come up to operating temper-

ature. Adjust the IDLE screw CW (higher) or CCW
(lower) until IDLE speed is 1200 RPM.

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.

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.

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