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Maintenance &
Troubleshooting
Hydraulic system
DANGER!
NEVER adjust main relief above 3000 PSI!
This can cause severe injury or even death.
Running machine beyond 3000 psi will cause damage to valves, cylin-
ders and pump. Adjusting the machine to higher pressure settings will
immediately void warranty.
• Pressure gauge is installed for initial set up of machine, and can be a great diagnostic tool for
trouble shooting. If your machine is not building enough pressure to split a log, check to see how
much pressure it is building. You can check this pressure setting with the engine running at full
throttle… Extend splitting ram all the way and hold the lever for 2 seconds. Watch the pressure
gauge to determine operating pressure on gauge.
• If you feel that the pressure gauge is faulty or has been damaged, do not adjust main relief!
Contact Wolfe Ridge MFG and replace gauge immediately.
• To adjust main relief, first remove outer nut with ½” wrench. Then loosen jam nut with 9/16
wrench. Use 3/16 Allen wrench to turn adjustment screw clockwise to increase pressure, or
counter-clockwise to decrease pressure
Pressure gauge
Main relief adjustment
Summary of Contents for 28HDI
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