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VALVES SPOOL RESPONSE SLUGGISH:

Check for dirt in the system. Drain and flush system. Disassemble and clean if necessary.

Check for restricted drain. Check fittings or drain lines.

Check for low pilot pressure. Check for pilot pressure system if applicable.

Check for malfunctions of solenoids. Check for proper source and voltage.

Check for distortion of the valve body. Check flatness of mounting surface. Align the valve body and piping to remove strain. Loosen mounting bolts.

Check flow rate through valve. Must be within valve flow limits.

VALVE SPOOL FAILS TO MOVE:

Check for dirt in the system. Disassemble, clean and flush.

Check for blocked drain. Inspect for plugs or foreign matter.

Check to see if the pilot pressure is off. Check the source of pilot pressure.

Check to see if solenoids are inoperative. Check the electrical source and solenoid coils.

Check distortion of the valve body. Check flatness of mounting surface. Align the valve body and piping to remove strain. Loosen mounting bolts.

Check for improper reassembly after repair. Use master parts page and repair pages for proper assembly, parts and procedures.

VALVE PRODUCES AN UNDESIRED RESPONSE:

Check for improper installation connections. Check the installation drawings.

Check for improper assembly of valves. Check master parts pages and installation drawings.

Check flow rate through valve.