Lifter operates slowly
Check the flow adjustment on the diverter valve. Use a flow meter to make sure each lifter receives
approximately 3.5 gpm. Adjust diverter as needed following instructions in the manual.
Engine idle may be too low to provide adequate flow. Following the manufacturer’s instructions, adjust
the engine idle. Remember increasing engine idle will increase fuel consumption.
The hand valve may be faulty. Check, clean and/or replace as needed.
The truck’s pump may be faulty, unable to deliver the desired flow. Contact your truck manufacturer.
In rare instances, debris within the oil may be clogging the diverter valve. Check and clean the valve as
needed.
Lifter operates too fast
Check diverter valve adjustment screw. Adjust in to lower the flow delivered to the lifters.
Engine idle speed may be too high. Adjust per the manufacturer instructions.
Diverter valve is leaking oil
Worn or Damaged seals within the diverter will cause external leaking. Rebuild the valve using D63477
divert valve spring kit.
Hand valve lever sticks, does not return to center
A worn or broken spring on the spool will cause the handle to fail to return to center. This is dangerous,
since this means the deadman stop feature is not working. Check and replace the spring with part
number D63192.
If the spring is not the problem, check and clean the hand valve of any rust/corrosion and debris in or
around the spool or the external parts.
On new installations, this is the result of having the pressure and tank lines reversed. Check and make
sure that the pressure line goes to the “IN” port and the tank line goes to the “OUT” port.
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