Komatsu 830E Shop Manual page 368

TROUBLE: Differential Pressure Warning Circuit activates Briefly When Brakes are Applied or Released
Brake valve out of balance (not tracking).
Differential pressure switch is defective or is improp-
erly adjusted.
Accumulator precharge/leak.
Problem in brake valve subassembly.
Air in one brake circuit.
Small leak in one circuit.
Brake warning delay timer defective
TROUBLE: The Differential Pressure Warning Circuit is not Operating
Low Brake Pressure lamp is burned out.
Electrical problem.
Differential pressure switch is defective or is improp-
erly adjusted.
Problem in brake valve assembly.
Brake warning relay defective.
TROUBLE: A Low Brake Pressure Warning Occurs When Brakes are Applied
Leak or other malfunction in one brake circuit.
Brake valve balance is out of adjustment.
Differential pressure switch is defective or is improp-
erly adjusted.
TROUBLE: The Low Pressure Warning Circuit Not Operating Properly
The Low Brake Pressure lamp is burned out.
The circuit is open.
Pressure switch defective.
J4-8
Adjust collars according to instructions.
Check the switch and replace if necessary. Check
differential pressure switch adjustment.
NOTE: Refer to Step 30, Table I - Differential
Pressure Switch Adjustment. If the differential
pressure switch is O.K. and the differential pressure
indicates a "red" spring is being used, replace "red"
spring in Differential Pressure Switch Assembly with
"green" spring and re-adjust differential pressures
according to Table I.
Check accumulators and recharge if necessary.
Remove, disassemble, clean, and inspect brake
valve assembly or replace it.
Bleed brakes.
Inspect brake system and repair leaks.
Replace timer.
Replace bulb.
Check wiring.
Check the switch and replace if necessary.Check
differential pressure switch adjustment. Refer to
Table I - Differential Pressure Switch Adjustment.
See NOTE: above.
Remove, disassemble, clean, and inspect, or
replace brake valve.
Replace relay.
Inspect brake system and repair leaks.
Adjust collars according to instructions.
Check the switch and replace if necessary.Check
differential pressure switch adjustment. Refer to
Table I - Differential Pressure Switch Adjustment.
See NOTE: above.
Replace the bulb.
Check the wiring.
Replace the pressure switch.
Brake Circuit Check-Out Procedure J04031