Plunger Pump Maintenance

Symptoms	Probable Cause	Recommended Action
Will not Prime	Air Leak Blocked Line Worn packing Worn plunger Worn valves and/or seat Clogged valve chambers Suction lift too great Closed valves	Tighten all suction line joints, couplings or connections Clean line Adjust and/or replace Replace Replace Clean valve chambers, ball valves and seat Relocate pump closer to liquid and fill pump body with water Open valves
Will not Pump	Clogged valve chambers Closed valves Blocked suction line Sheared eccentric pin Recirculation through a by-pass line Broken or slipping belts	Clean valve chambers, ball valves and seats Open valves Clean out Replace pin and retorque eccentric flanges Check for open relief valve or blown rupture disc Replace or retention
Noisy Pump	Water-logged chambers Worn eccentric and/or wrist pin bearings	Drain and recharge Reshim rod, repair or replace
Excessive Power Draw	Excessive operating head Pump packing too tight	Check for closed or clogged valves or lines. Compare discharge pressure with specified operating conditions Readjust packing gland
Hot Eccentric Bearing	Insufficient lubrication Bearing improperly shimmed Insert worn	Establish oil flow to the bearing Reshim Replace insert and eccentric
Eccentric Pin Failure	Excessive discharge pressure Eccentric bolts loose Eccentric flanges oily Pump packing too tight Eccentric bearing clearance too great	Inspect valves and lines for clogging Tighten to proper torque Wash off oil and retorque bolts Readjust packing gland Inspect bearing and reshim
Low Capacity	Speed too low on variable speed drive Pump stroke set too short Air leak in suction line Recirculation through a by-pass line	Reset speed, count strokes Set to longer stroke length Check for leaks, hydrostatically test Check for open relief valve or blown rupture disc

Tools Required for pump maintenance:

Certified torque wrench

Socket heads required: 7/8, 15/16, 9 /16, ½, ¾ and 1-1/8

2 – engineer wrenches (size: 3/4)

1 – large flat head screwdriver

1 – Gallon of 90 Gear Oil or equivalent

1 – Feeler gauge