G. PRESSURE FAILS TO DROP WHEN GUN VALVE IS CLOSED
1.
Defective unloading valve, sticking check valve.
Clean or replace, install seal kit.
2.
Leak in gun, fittings or hose under high pressure.
Repair leak.
H.
PUMP OIL DISCOLORATION
1.
White foam
– water in oil.
Drain and replace with CAT pump oil or temporarily with S.A.E. 30 non-
detergent hydraulic oil. Faulty intake seals from wear or freezing, replace
intake seals
2.
Brown foam
– rust & water.
Pump needs rebuilding if pressure is dropping and a rapid re-
occurrence of foam in sight glass occurs after several hours of operation
with fresh oil.
I.
WATER OR OIL LEAKING FROM BOTTOM OF PUMP
1.
Water
– noticeable amounts.
Inlet water seals on pistons failing. See appropriate pump manual.
Cracked pump manifold from freezing
– replace.
2.
Oil
– noticeable amounts.
Leak and failure of oil seals on pistons. Return to Siebrings for repair
(notify to verify condition).
3.
Leaking from pump oil fill cap
Oil level too far above red dot on the pump sight glass
Leaking pump intake seals allowing water into crank case of the pump
J.
WATER SUPPLY AND CONTAMINATION
1.
Sand from private wells or ponds.
Allow water sample to stand in clear glass bottle over night to observe
sediment. Add intake line filter if in doubt.
2.
High sulphur.
Brass parts may need replacement when used in high concentrations of
sulphur or chelated iron.
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