3-22
PRESSURE SETTINGS:
The hydraulic system is divided into two pressure circuits, each having its own protective ad-
justable relief valve in the inlet sections of the control valve. The functions operated by the con-
trol valve sections require different pressures for different functions. These are shown below:
1. Winch Circuit -- 2500 PSI (172bar) at full flow.
2. Boom and Outrigger Circuit -- 3000 PSI (207bar) at full flow.
3. Boom swing work ports -- 1500 PSI (103bar) at full flow.
A good quality pressure gauge with at least a 3000 PSI (207bar) scale is required to make ad-
justments properly. A 3000 PSI (207bar) working pressure hose with adapters to fit the 3/8 tube
pressure ports is required to install the gauge where it can be read easily.
The following procedures are suggested when taking pressure readings:
HOIST CIRCUIT:
Remove the 3/8" JIC cap from the fitting on the front of the control valve near the hoist control
section and install a 3000 PSI (207bar) pressure gauge. To obtain full flow reading, run pump
full speed, pull hoist control to RAISE position and hold until maximum reading is made. The
anti-two-block override switch must be actuated. If a pressure of 2500 PSI (172bar) is not pos-
sible, check the following:
1. Broken mechanical connection to the pump shaft.
2. Low oil level in the reservoir.
3. Clogged suction filter or shutoff valve not fully opened.
4. Valve spool linkage not allowing control valve to fully open. Valve spool should move 3/8"
(9.5mm) each way from neutral position.
5. Anti-two-block system malfunction.
6. Adjust relief valve by loosening nut on top of relief cartridge above winch gauge port and
turning socket-head screw clockwise to increase pressure or counter-clockwise to lower
pressure.
7. Foreign particle in pilot operated relief.
8. Worn or defective hydraulic pump.
Summary of Contents for IC-250
Page 6: ...1 2 IC 250 3E DIMENSIONS...
Page 7: ...1 3 IC 250 3E TURNING DIMENSIONS...
Page 30: ...2 14...
Page 42: ......
Page 51: ...3 9 IC 250 3E LUBRICATION CHART...
Page 58: ...3 16...
Page 59: ...3 17...
Page 68: ...3 26 BOOM CHAIN ADJUSTMENT...
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