Sun Pumps SPB 10-16C-1.0 - Manual (Page 11)

o-ring, or drain plug o-ring
Oil leakage from drain plug *Loose drain plug or worn drain plug o-ring Tighten drain plug or replace o-ring
Loud knocking noise in *Pulley loose on crankshaft Check key and tighten set screw
the pump *Broken or worn bearing Replace bearing
Check alignment and belt position
Frequent or premature *Scored rods or sleeves Replace rods and sleeves
failure of the inlet manifold *Over pressure to inlet manifold Reduce inlet pressure
seals *Stressful inlet conditions Pressurize inlet
Short cup life *Abrasive material in fluid being pumped Install proper filtration on pump inlet plumbing
*Excessive pressure and/or temperature Check discharge pressure, fluid temperature, or
of fluid being pumped control valve by-pass.
*Running pump dry Do not run pump without water.
*Front edge of piston sharp. Replace with new piston.
*Chrome plating of cylinders damaged Install new cups and cylinders
causing excessive wear of cups. May be
caused by pumping acid solution
*Short life on cups on cylinders Stressful inlet conditions
Strong surging at the inlet *Foreign particles in the inlet or Check for smooth mating surfaces or inlet
and low pressure on the discharge valve or worn inlet and/or inlet valves and discharge valve sealts.
discharge side discharge valves F.V. and inlet valves may be lapped
on a very fine oil stone; Q.V. parts must
be replaced.