BODY ASSEM. 9L1724 - Caterpillar

Problem 5
The standby pressure cannot be adjusted correctly.Probable Causes
The flow compensator spring that is in the control valve in the implement is damaged. Remove the spring and inspect the spring for damage.
The flow compensator spool has damage or the spool has contamination. Remove the spool and inspect the spool.Problem 6
A hydraulic circuit is hammering.Probable Causes
There is air in the system. Refer to "Problem 11".
You are not using the machine correctly.
The line relief valves are not set correctly.
The standby pressure is not correct.
The pilot pressure is not set correctly.Problem 7
You cannot lower the boom.Probable Causes
There is a loss in pilot pressure.
The spool cannot shift.
The down solenoid for the boom failed.Problem 8
You cannot raise the boom or you cannot lower the boom.Probable Causes
None of the other functions are operating correctly. Refer to "Problem 2".
The lift cylinder has damage. Replace the cylinder.
The mechanical linkage of the boom has damage. Repair the damage.
The pilot control valve is not working correctly.
There is a failure in one of the seals of the lift cylinder.
The main control spool is stuck. Disassemble the valve. Inspect the main control spool and inspect the springs.
The area control spools in the lift control valve are stuck. Disassemble the valve. Inspect the area control valves and inspect the springs.Problem 9
You cannot operate the grapple.Probable Causes
None of the other functions are operating correctly. Refer to "Problem 2".
The cylinders have damage. Repair the damage.
The line relief valves or the implement valve are not operating correctly. Check the settings for the line relief valves.
The pilot control valve is not working correctly.
The seals in one of the cylinders are leaking.
The main control spool is stuck. Disassemble the valve. Inspect the main control spool and inspect the springs.Problem 10
The oil temperature is too high.Probable Causes
The oil temperature sensor is not operating properly.
The oil level is low.
The hydraulic oil cooler is plugged. Inspect the hydraulic oil cooler and clean the hydraulic oil cooler.
There is air in the hydraulic oil. Refer to "Problem 11".
The viscosity of the oil is incorrect.
The settings for the relief valve are too low.
The oil is contaminated. Replace the filter. Remove the cap from the hydraulic oil tank and inspect the sump screen.Problem 11
There are air bubbles in the oil.Note: A problem with air in the hydraulic oil must be corrected before the hydraulic system will operate at normal temperatures.Probable Causes
There is a loose connection on the oil line on the inlet side of the pump. Visually inspect the supply lines of the pump for leaks and repair the leaks.
Return oil flows into the hydraulic tank above the level of oil that is in the tank. The oil level is low.
The cylinders are cavitating because the back pressure valve is not maintaining pressure in the return passages in the bank valve.
A makeup valve in the lift control valve or the tilt control valve is not opening. Inspect the lines that connect the bank valves to the cylinders for damage.Crane Trouble Shooting
Problem 1
Crane makes "Cracking" noises during operation.Probable Causes
Mechanical parts may be damaged.
Bad maintenance,