Case CX130 - Page 257

HYDRAULIC PRESSURE SETTINGS
7 - 21
CASE TRAINING CENTER
AUGUST 2000
No swing or slow swing
(No problems with other functions)
With the excavator on a slope, the swing brake does not hold
No. Tests Results Repairs
1 Check the swing pressure Pressure too low
Adjust or change the secondary relief
valves
2
Disconnect the swing brake solenoid
valve (pink connector) and operate
the swing
No swing or slow swing
Reconnect the solenoid valve and
check the swing brake release
pressure at the output from the
solenoid valve (No. 3)
The swing operates normally
Check the solenoid valve supply
electrical circuit
3
With the engine running and the
swing brake deactivated, check the
swing brake release pressure
Pressure below 30 bar
Check or change the swing brake
solenoid valve
Pressure greater than 30 bar
Check the swing motor for leaks
(No. 5)
4
Disconnect the swing cancellation
solenoid valve (green connector) and
operate the swing
No swing or slow swing
Check or change the swing
cancellation solenoid valve
The swing operates normally
Check the solenoid valve supply
electrical circuit
5
With the engine at full speed, and
hydraulic oil at 50°C, check for leaks
at the swing motor during the swing
Greater than 2 L/min Change or repair the swing motor
Below 2 L/min
Check the swing brake, repair or
change
No. Tests Results Repairs
1 Check the swing braking system Abrasion
Incident on the brake, repair or
change
2 Check the swing pressure Pressure too low
Adjust or change the secondary
relief valves
3
With the engine at full speed, and
hydraulic oil at 50°C, check for leaks
on the swing motor during the swing
Greater than 2 L/min Change or repair the swing motor
4
Check the swing brake pilot pressure
at the solenoid valve output
Pressure greater than 1 bar
(0.1 MPa)
Check electrical supply and the
solenoid valve coil (No. 5 and 6)
5
Check the voltage at the electrical
plug on the swing brake pilot
solenoid valve
Voltage < 24 V Check the electrical harness
6 Check the pilot solenoid valve coil
Infinite or 0 Ohm Change the solenoid valve
About 40 Ohm Change the solenoid valve coil