904H Compact Wheel Loader Hydraulic and Steering System Caterpillar

The following tables are provided in order to record information as you perform the tests on the machine. Make copies of these tables so that the tables may be reused for other machines.

The worksheet is designed to be used for the following tests:

• Engine Idle

• Pilot Pressure

• Steering Pressure

• Main Relief Valve

• Line Relief Valves

• Drift Checks

• Implement Cycle Times

• Steering Cycle Times

Troubleshooting Worksheet

The following tables are provided in order to record information as you perform the tests on the machine.

Table 1

MACHINE MODEL		DATE
SERIAL NUMBER		SERVICE METER HOURS
ENGINE SERIAL NUMBER		ARRANGEMENT NUMBER

Table 2

ENGINE IDLE
TEST	ENGINE SPEED (rpm)	ACTUAL
HIGH Idle	2630 ± 50
LOW Idle	975 ± 50

Table 3

PILOT SYSTEM PRESSURE TEST
ENGINE SPEED	PILOT SUPPLY PRESSURE	ACTUAL
HIGH Idle	3660 ± 300 kPa (530 ± 45 psi)
LOW Idle	3200 ± 300 kPa (465 ± 45 psi)

Table 4

STEERING SYSTEM PRESSURE TEST
STEERING TEST	RELIEF PRESSURE	ACTUAL
Stall LEFT	19400 ± 800 kPa (2814 ± 116 psi)
Stall RIGHT	19400 ± 800 kPa (2814 ± 116 psi)

Table 5

MAIN RELIEF VALVE
TEST (HIGH IDLE)	PRESSURE	ACTUAL
Main Relief	20600 ± 700 kPa (2988 ± 102 psi)

Table 6

LINE RELIEF VALVE (BENCH TEST)
TEST (HIGH IDLE)		PRESSURE	ACTUAL
Tilt Cylinder TILT BACK		22100 ± 700 kPa (3205 ± 102 psi)
Tilt Cylinder DUMP		22100 ± 700 kPa (3205 ± 102 psi)
Auxiliary Circuit		22100 ± 700 kPa (3205 ± 102 psi)
Auxiliary Circuit		22100 ± 700 kPa (3205 ± 102 psi)

Table 7

LIFT CYLINDER DRIFT
BUCKET	TIME	MAXIMUM DRIFT	ACTUAL
General Purpose	Table 9	7 mm (0.28 inch)

Table 8

TILT CYLINDER DRIFT
BUCKET	TIME	MAXIMUM DRIFT	ACTUAL
General Purpose	Table 9	7 mm (0.28 inch)

Table 9

CYLINDER DRIFT TEST
HYDRAULIC OIL TEMPERATURE	TEST TIME (min)
40 °C (104 °F)	5.0
50 °C (122 °F)	3.4
60 °C (140 °F)	2.3
70 °C (158 °F)	1.7
80 °C (176 °F)	1.3

Table 10

IMPLEMENT CYCLE TIME
POSITION	TIME (sec)	ACTUAL
Lift RAISE	4.3 ± 0.3
Tilt TILT BACK	1.6 ± 0.3

Table 11

STEERING CYCLE TIME
STOP TO STOP	TIME (sec)	ACTUAL
LEFT to RIGHT	3.0 ± 0.5
RIGHT to LEFT	4.2 ± 0.5