SEAL GROUP 7M0481 - Caterpillar

Well PumpWSF223 (S/N: FNL1-UP)WSF223 SS (S/N: BM81-UP)WSF255 SS (S/N: BM91-UP)WSF255 XD (S/N: FNP1-UP)Well Stimulation PumpWS223 (S/N: SR31-UP)WS223 SS (S/N: BM31-UP)WS223 XD (S/N: SR41-UP)WS255 (S/N: SR51-UP)WS255 SS (S/N: BM51-UP)WS255 XD (S/N: SR61-UP)WS273 XD (S/N: DG21-UP)WS305 XD (S/N: EA21-UP)WSF255 XD (S/N: P231-UP)Well Stimulation Pump Fluid EndWS255 SS (S/N: AE31-UP)WSF223 (S/N: FN41-UP)WSF223 SS (S/N: BM41-UP)WSF223 XD (S/N: FN31-UP; FNM1-UP)WSF243 SS (S/N: RX21-UP; RX31-UP; RX41-UP; RX51-UP)WSF243 XD (S/N: FN91-UP; FNC1-UP; FND1-UP; FNE1-UP)WSF253 SS (S/N: RWC1-UP; RWD1-UP)WSF253 XD (S/N: FN81-UP; FNT1-UP)WSF255 (S/N: AE51-UP; FN51-UP; FN61-UP; FN71-UP)WSF255 SS (S/N: AE41-UP; BM61-UP; BM71-UP)WSF255 XD (S/N: AE21-UP; FN21-UP)WSF273 XD (S/N: DG41-UP; DG51-UP; DG61-UP)WSF275 SS (S/N: RX61-UP; RX71-UP; RX81-UP; RX91-UP)WSF275 XD (S/N: FNB1-UP; FNF1-UP; FNG1-UP; FNH1-UP)WSF305 XD (S/N: EA41-UP; EA51-UP; EA61-UP; EA71-UP)Well Stimulation Pump Power EndWSP223 (S/N: FNJ1-UP)WSP255 (S/N: FNK1-UP)WSP273 (S/N: DG31-UP)WSP305 (S/N: EA31-UP)Introduction
Do not perform any procedure in this Special Instruction until you have read the information and understand the information.This Special Instruction covers the troubleshooting for the well stimulation pump.Troubleshooting of the Caterpillar Well Stimulation Pumps
The following procedures cover the troubleshooting and repairs for the well stimulation pumps.No Fluid Delivery to Pump
Table 1
Symptom Description Probable Cause Suggested Action
No fluid delivery through the pump. 1. The pump is not primed for operation. Repair : Prime the pump for proper operating conditions.
2. An air or vapor pocket is in the suction line. Repair : Relive the air or vapor pocket from the suction line.
3. The suction line has become clogged. Repair : Clean the suction of any obstacles that restrict flow.
4. The suction and/or discharge valves are stuck open. Repair : Remove any obstructions that do allow for proper operation of the discharges valves. Low Fluid Discharge Pressure from the Pump
Table 2
Symptom Description Probable Cause Suggested Action
Low fluid discharge from the pump. 1. A check valve has become worn or damaged. Repair : Replace the valve assembly as necessary.
2. A check valve is stuck open. Repair : Remove any obstructions that do allow for proper operation of the discharges valves.
3. Cavitation of the pump has occurred. Repair : Refer to Special Instruction, REHS8177, "Cavitation".
4. Fluid is leaking from the fluid end of the pump. Repair : Replace the plungers, packing, and/or fluid end seals as necessary. Low Suction Pressure
Table 3
Symptom Description Probable Cause Suggested Action
Low suction side pressure. 1. Low head pressure.