BONNET 3208057 - Caterpillar

Response of one implement is too slow.
Probable Causes
The implement valve spool is not fully shifted.
The lever linkage or lever travel is restricted.
The wrong control valve for the implement is installed in the valve bank.
The control valve is damaged. All of the implement cycle times are too slow.
Probable Causes
The air purge valve on the controls for the implement pump is open.
The margin pressure setting is too low.
There is a blockage or a leakage in the signal network. The problem is caused by the following causes:
The signal line is plugged or the line is not hooked up.
The shuttle valve is stuck open or the valve has a failed seal.
The flow control sleeve that is behind the flow control spring has a failed seal.
The plug that is in the end of the control valve spool has a failed seal.
The pump control is damaged.
The pump is not at full stroke.
The diameter of the hoses or the fittings is incorrect. The implement droops when the control lever is moved from the HOLD position to the RAISE position.
Probable Causes
The load check valve is not closing. The problem is caused by the following causes:
The spring is weak or broken.
The valve has dirt or debris.
There is a damaged seat. There is too much implement drift.
Probable Causes
The valve spool in the control valve is not correctly centered. The problem is caused by the following causes:
There is a broken spring.
There is a sticky valve spool.
There is a misadjusted linkage.
There is leakage around the seals on the piston.
There is leakage past the makeup valve or the makeup valve seals have failed.
The quick-drop valve or the end stroke bypass valves may be leaking.
The control valve has too much wear. All of the implement circuits are unstable.
Probable Causes
Hydraulic oil is too thick or the oil is the wrong type. Warm oil to operating temperature.
The hydraulic pump is damaged.
Air in oil or air is trapped in signal line. Implement cycle times are too fast.
Probable Cause
The flow control valve(s) failed or there is a incorrect spool. An implement moves with the control valve in the HOLD position.
Probable Causes
The control valve and the valve spool have a large amount of wear.
The seals in the cylinder piston have failed or the seals are worn.
The load check valve is damaged. There is an excessive pause at the ground line when the bulldozer is lowered.
Probable Causes
The quick-drop valve is not operating correctly.
The makeup valve is stuck open.
There is a restriction in a hose. The implement surges when the implement is first activated.
Probable Cause
The slots in the control stem are not machined correctly. Too much effort is needed to move the control lever.
Probable Causes
The lever linkage is restricted or the linkage has interference.
The wrong control valve is installed in the valve bank.
The flow control spool in the control valve is sticking or damaged. The response of the implement is too fast.
Probable Causes
The wrong control valve is installed in the valve bank.
The control valve is damaged. The pump does not return to standby pressure after the implement is used.
Probable