Document P/N:
2P121260
Release Date: 02/27/2017
Revision: E
29 of 41
Quarterly (or every 600 hours) Preventive Maintenance (Cont.):
Change power end filters.
Remove and inspect the plungers and packing assembly components. Replace all packing pressure
rings and header rings.
Clean the plunger pump’s oil breather and the power end lube oil reservoir breather.
Replace fluid end valve springs.
Yearly (or as required) Preventive Maintenance:
Replace worn plungers and packing brass.
Replace worn or corroded valve covers, suction valve stops, packing nuts, discharge flanges, pump
tools, etc.
Replace all discharge flange seals and suction manifold seals.
Replace any defective gauges and instruments.
Inspect (and rebuild if necessary) the power end lube oil pump.
Replace the shell bearings. Retorque connecting rod housing bolts to correct torque values.
It is difficult to assess wear and tear on a pump based solely on hours operated, due to the variations in duty
cycle and types of service. However, roller bearings, rod bearings and gearing may need replacing after
approximately 1200 to 3000 hours. With either component, signs of extensive wear will generally show up as
spalling, or flaking off, of material causing pitting or scoring on the working surfaces. A small amount of this is
tolerable on gear faces, but any spalling on a bearing surface is an indication to replace that item as quickly as
feasible.
Failure of a main bearing can quite often lead to power frame, crankshaft, or other serious damage.
Close observation of the lube oil filters during routine maintenance will generally indicate the condition of roller
bearings, gears, and journal bearings. A routine of pulling the inspection covers and inspecting the condition of
the bearings and gears every 1000 hours is recommended.
Expendable Components:
A. Expendable life improvement techniques:
a. Valves and valve seats
Valves and valve seats wear out faster than any other expendable due to valve seat damage
from frac sand and cavitation corrosion pitting. Valve life can be extended by keeping valve-flow-
through velocities below 12 feet/sec and by using a properly sized, correct style and properly
installed pulsation suction stabilizer.
WARNING: VALVES AND VALVE SEATS MUST BE REPLACED PRIOR TO FAILURE. FAILURE OF A
DISCHARGE AND SUCTION VALVE IN THE SAME PLUNGER PRESSURE CHAMBER CAN RESULT
IN DISCHARGE (WELL BORE) PRESSURE ENTERING THE SUCTION MANIFOLD. FAILURE OF THE
SUCTION MANIFOLD, SUCTION FLOW LINES OR HOSES CAN RESULT. INJURY, DEATH OR
ENVIRONMENTAL DAMAGE CAN OCCUR. USE OF A CHECK VALVE IN THE FLOW LINE IS
RECOMMENDED.
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