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Hydro Pump does not Reciprocate      
Probable Cause Solution
Insufficient / Unavailable Dive Air Check Drive Air Isolation Valve. Open the valve if it is closed.

Check the Drive Air Supply, ensure the available pressure is between 7 to 10 bar.
Hydro Pump Air shuttle valve is sticking. Remove and clean air valve and housing assembly and its shuttle valve components.

Adjust air lubricator.
Connecting rod is improperly adjusted or bent (may occur after pump overhaul). Readjust rod and nut. Refer the Hydro Pump Manual.

Straighten or replace rod.
Hydro Pump Spring in shuttle valve is broken. Replace spring.
Hydro Pump Reciprocates but does not deliver Fluid      
Probable Cause Solution
Fluid supply is low. Add fluid as required.
Fluid supply line to pump inlet check valve is clogged. Remove and clean line. Check reservoir, its inlet filter and outlet for accumulation of foreign matter. Clean as required.
Foreign matter is lodged in pump inlet and outlet check valves. Remove and clean check valves. Replace o- rings  on poppets.
Hydro Pump Reciprocates but does not deliver / hold Pressure      
Probable Cause Solution
Drain or Depressurizing Valve is Open. Ensure that the drain / depressurizing valve is closed tightly and does not leak.
Leakage or blockage at inlet or outlet Check Valve of the Hydro Pump. Remove and clean the Hydro Pump Check Valves. Look for foreign matter logged in sealing areas.

Replace damaged or worn o-rings.
High Pressure Seals of The Hydro Pump damaged. Replace High Pressure Seals. Refer Hydro Pump Manual.
Low Pressure seals of the Hydro Pump damaged. Replace Low Pressure Seals. Refer Hydro Pump Manual.
Water / Hydraulic Fluid in Exhaust Air Muffler      
Probable Cause Solution
Excessively wet Drive Air. Drain water from Drive Air Line.
Damaged Seals in Pump Fluid Body. Replace Fluid Body Seals. Refer Hydro Pump Manual.
Pump Fluid Piston Scored. Inspect Fluid Piston for score marks; polish repair or replace fluid piston. Hydro Pump Manual.
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