INTERPUMP pumps are delivered ready with their first oil filling and transport plug (red) to prevent oil leakage during shipping. Oil dip-stick with level gauge and breather hole (black/yellow) are supplied separately. Before starting up the pump, replace the transport plug with the dip-stick.

The first oil must be changed after the first 50 hours of pump operation, while successive changes are required every 500 hours.
We recommend the use of INTERPUMP X.9.9. (SAE 20/30) or equivalent oil (included with each pump is an instruction manual listing compatible oils).
Between oil changes, periodically check the oil level in the clear gauge or using the dip-stick, and top-up if necessary.
During scheduled checks, also check that water has not seeped into the oil (if it has, the oil will be whitish in color).
Seepage may be caused by excessive seal leaks (poor maintenance) or condensation build-up in surroundings that are very humid or subject to wide temperature swings. Other components subject to wear that must be periodically checked and replaced are the gasket seals and suction and delivery valves. Seals wear can be noticed by a drop in pump pressure or formation of drops under the pump where the head is connected to the crankase. If this happens, the entire seal set must be replaced as soon as possible to avoid water seeping into the crankase and damaging mechanical parts.
To replace the seal, use the special tool kit or those found in our tool case; always use original spare parts. Wear can be noticed by a drop or variation in pressure, and often machine vibrations of inlet/outlet valve. If the pump is to remain inactive for an extended period of time, it is a good idea to drain it completely. To do this, disconnect the inlet and outlet pipes and run the pump empty for a few seconds (10 sec. max.). This precaution is absolutely indispensable if the pump is to remain at a temperature below 0°C, even for a short period of time.

Interpump Pump Trouble Shooting Guide