Throttle System Check And Adjustment; Electronic Throttle System - Komatsu 830E Shop Manual

1.1 Throttle System Check and Adjustment

NOTE: If the truck is an early production unit, not equipped with the Fuel Enhancement ("Fuel
Saver") system, refer to step 1.1.1. If the truck is a later or current production unit, refer to step
1.1.2.
1.1.1 Electronic Throttle System. (Williams electronic foot pedal, Dresser ACC/RET Interface Circuit
and Pedal Detector Card).
NOTE: Foot pedal with adjustable pedal potentiometer is used with a TZ6661 or EB2635 (non-
adjustable) ACC card. Non-adjustable foot pedal requires use of EC1806 (adjustable) ACC card.
1. Turn key switch On.
2. Turn control power switch in control cabinet to the Off position.
3. Normal/Advance Idle switch should be in the Off ("Normal") position.
Measure 4.80 ±0.10 vdc between circuits 916 and 952 in Control Cabinet.
4. If not correct, check 916 circuit to engine.
5. If available, use the DDR (DDEC engine trucks) to read the PTO counts or use a voltmeter to
measure voltages shown below. (The Control Power switch and Normal/Advance Idle switch
should be in the Off ("Normal") position and the accelerator pedal released.) If unable to adjust
properly, replace ACC card.
STEP CIRCUIT
525(+)
1 to
952(-)
510(+)
2 to
952(-)
6. Measure the voltage between circuits 76L and 710.
Read 25.25 to 28 vdc. If voltage is low, recharge truck batteries.
7. With the Normal/Advance Idle switch in Off ("Normal") position, turn key switch Off, then On.
Measure voltage between circuits 510 to 952. Repeat 3 times. If voltage ever reaches or
exceeds 2.0 vdc, replace ACC card. Verify the Normal/Advance Idle switch is in Off posi-
tion.
8. Turn control power switch On, place selector switch in FORWARD. With throttle pedal
depressed just until propulsion contactors pick up, measure the following:
CIRCUIT
510(+)
to
952(-)
E03012 2/02
ACC
VOLTS
CARD
TZ6661 .75 (approx.)
EB2635 .78 (approx.)
EC1806 .53 (approx.)
TZ6661 .34 (approx.)
EB2635 .37 (approx.)
EC1806 .40 (approx.)
ACC CARD
TZ6661
EB2635
EC1806
Statex III Electrical Checkout Procedure
PTO
COUNTS
18 ±1
Position of pedal potentiometer. If unable to adjust,
replace potentiometer.
17 ±1
Adjust P1 on ACC card. If unable to adjust, replace
21 ±3
pedal assembly.
18 ±1
If out of tolerance, replace ACC card.
17 ±1
Adjust P1 on ACC card (Seal pot). If unable to adjust,
21 ±3
replace pedal assembly.
VOLTS PTO COUNTS
.107 (approx.)
.68 (approx.)
.64 (approx.)
ADJUSTMENT
33 ±2
32 ±2
34 ±2
E3-5