| malfunction | cause | Method of exclusion |
| No pressure or stress after start up | 1, the pilot valve in the middle and lower orifice blocked; 2, unloading valve main valve stuck, or damaged; 3, thrust piston seal ring damage; 4, unloading valve pilot valve stuck, or damaged; | 1, to clear the throttle block; 2, check the main valve is stuck or damaged; 3, replace the thrust piston seal; 4, check the pilot valve is stuck or damaged; |
| Pressure pulsation, lack of flow or no flow, and even pipeline vibration, serious noise | 1, pumping liquid chamber air is not discharged net; 2, plunger seals, aspirating liquid; 3, suction hose too thin or dead curve; 4, Suction valve spring breakage or spool damage; 5, the suction valve screwed plug is not tightened; 6, liquid suction filter is blocked; | 1, Loosen the pump bleed screw, put net weight air; 2, remove the drain valve to fill the plunger cavity; 3, exchange suction pipe or eliminate dead bend; 4, replace the spring or replace the spool; 5, Tighten the suction valve screw plug; 6, cleaning liquid tank suction filter; |
| Plunger seal at a serious leak | 1, plunger seal wear or damage; 2, the plunger surface has a serious scratch, nap; | 1, replace the seal; 2, replace or repair the plunger; |
| Pump running noise, a percussion sound | 1, bush gap increased; 2, pump debris; 3, the motor and pump axis is not coaxial; 4, there is a gap between the plunger and the pressure block; | 1, replace the bearing; 2, clear debris; 3, adjust the motor and pump, so that it is coaxial; 4, tighten the compression screw sleeve; |
| Case temperature is too high | 1, the oil is dirty or not enough; 2, bush damage or crankshaft hairless; | 1, refueling or cleaning the oil pool, oil change; 2, Repair crankshaft and change bearing; |
| Pump pressure suddenly rises above unloading valve setting pressure or safety valve setting pressure | 1, the upper or lower pilot valve plugged blocked; 2, the pilot valve regulator screw is misjudged; 3, safety valve failure; | 1, to clear the throttle block; 2, re-adjust the pressure; 3, check to adjust or replace the safety valve; |
| Stent stopped feeding unloading valve moves frequently | 1, stent system serious liquid leakage; 2, unloading valve check valve leakage; 3, pilot valve leak; | 1, to eliminate the leakage area of ​​the face bracket; 2, check the replacement check valve; 3, check pilot valve surface and seal; |
| Emulsion temperature is high | 1, the pilot valve sealing ring damage; 2, one-way valve overflow; | 1, check the pilot valve o-ring; 2, check the check valve for damage; |
2, unloading valve main valve stuck, or damaged;
3, thrust piston seal ring damage;
4, unloading valve pilot valve stuck, or damaged; 1, to clear the throttle block;
2, check the main valve is stuck or damaged;
3, replace the thrust piston seal;
4, check the pilot valve is stuck or damaged; pressure pulsation, lack of flow or no flow, and even pipeline vibration, serious noise 1, the pump chamber air is not discharged net;
2, piston seals, aspirating liquid;
3, suction hose too thin or dead curve;
4, Suction valve spring breakage or spool damage;
5, the suction valve screwed plug is not tightened;
6, liquid suction filter is blocked; 1, loosen the pump bleed screw, put the net air;
2, remove the drain valve to fill the plunger cavity;
3, exchange suction pipe or eliminate dead bend;
4, replace the spring or replace the spool;
5, Tighten the suction valve screw plug;
6, liquid cleaning liquid suction filter; plunger seal leak serious 1, piston seal wear or damage;
2, the plunger surface has a serious scratch, nap; 1, replace the seal;
2, replace or repair the plunger; noise when the pump is running, a percussive sound 1, bearing clearance increased;
2, pump debris;
3, the motor and pump axis is not coaxial;
4, there is a gap between the plunger and the pressure block; 1, replace the bearing;
2, clear debris;
3, adjust the motor and pump, so that it is coaxial;
4, tighten the compression nut; box temperature is too high 1, the oil is dirty or not enough;
2, bush damage or crank hair; 1, refueling or cleaning the oil pool, oil change;
2, repair crankshaft and change the bearing pad; pump pressure suddenly rises above unloading valve setting pressure or safety valve setting pressure 1, the pilot valve above or below the throttle plug is blocked;
2, the pilot valve regulator screw is misjudged;
3, the safety valve failure; 1, to clear the throttling plug;
2, re-adjust the pressure;
3, check to adjust or replace the safety valve; bracket to stop the liquid when unloading valve action 1, the stent system serious liquid leakage;
2, unloading valve check valve leakage;
3, the pilot valve leaks; 1, to eliminate the leakage area face bracket;
2, check the replacement check valve;
3, check pilot valve surface and seal;
Emulsion temperature is high 1, the pilot valve seal damage;
2, one-way valve overflow; 1, check the pilot valve o-ring;
2, check the check valve for damage;
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