Water Spray System Caterpillar

Checks During Operation

The checks during operation can be used to find a valve or a pump that is not working correctly. The speed of the rod movement or the torque on a motor can be used to check the condition of the cylinders, the motors and the pumps.

1. Touch the cylinders as the cylinders extend and the cylinders retract. Movement must be smooth and regular.

2. Listen for noise from the pumps.

3. Listen for the sound of the relief valves when the relief valves open. Relief pressures that are too low will cause reduced force of all functions. This will cause an increase in oil temperatures and in the operating cycle time of the components.

   Note: Operating pressures that are too high will cause a decrease in the service life of hoses, components and structures.

4. Be aware of drift rate in the machine functions that are caused by cylinder leakage, control valve O-rings, or valves that do not seat properly. Drift may also be caused by a poor adjustment or a poor fit in the pilot valve or the main control valve.

Hydraulic Pump Troubleshooting

Show/hide table

Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

The problem is excessive noise in the pump.

The probable cause may be listed below.

1. Air is present in the system.

2. There is a vacuum system.

3. The hydraulic oil is too thick.

4. The ambient temperature is too low.

The problem with the hydraulic pump is overheating.

The probable cause may be listed below.

1. The oil level is too low.

2. There may be internal leakage.

3. The oil cooler is plugged.

The problem is inadequate system pressure.

The probable cause may be listed below.

1. The relief replenishing valve is open.

2. There is a loss of oil or internal leakage.

The problem is a loss of oil.

The probable cause may be listed below.

1. The oil lines are ruptured.

2. The fittings are loose.

3. The gaskets or seals are leaking in the pump.

The problem is no rotation of the pump.

The probable cause may be listed below.

1. The shaft key is sheared.

2. The drive mechanisms are broken or disconnected.

The problem is no pump flow.

The probable cause may be listed below.

1. The control linkage is misadjusted or broken.

Water Spray System Troubleshooting

The problem is failure with the pump priming.

The probable cause may be listed below.

1. There is an air leak in the suction line.

2. The lining of the suction hose collapsed.

3. The O-ring seal gasket is worn or leaking. The pump gasket is worn or leaking.

4. The suction lift or discharge is too high.

5. There is an air leak in the suction line.

The problem is a pump that has failed to deliver the rate of flow or the pressure.

The probable cause may be listed below.

1. The suction intake is not submerged at the proper level or the sump is too small.

2. The impeller or other wearing parts are worn or damaged.

3. The pump speed is too slow.

4. The discharge head is too high.

5. The suction lift is too high.

6. A pump gasket or a seal is worn or leaking.

7. The liquid that is pumped is too high.

The problem is too much power that is used by the pump.

The probable cause may be listed below.

1. The pump speed is too high.

2. The discharge head is too slow.

3. The liquid solution is too thick.

The problem is a pump that frequently clogs.

The probable cause may be listed below.

1. The discharge flow is too slow.

2. The suction check valve is binding or clogging.

The problem is excessive noise.

The probable cause may be listed below.

1. There is a cavitation in the pump.

2. The pump or drive is not securely mounted.

3. The impeller is clogged or damaged.

4. The suction and discharge lines are not properly supported.

The problem is a set of bearings that overheats.

The probable cause may be listed below.

1. There is inadequate lubrication.

2. The pump speed is too high.