Pump and pressure. Two functions slow at once and the gauge sags when the bucket bites. When several circuits fail together, the fault is upstream of all of them: relief, regulator, or the pump's rotating group.
Dead-head a function and read the main relief. A value 10–15% below rated and a hot tank confirm it.
Watch pump pressure at standby. If it hunts or sits low at no flow, the regulator is the suspect, not the rotating group.
Flow test at rated pressure: below 90% of catalogue flow means the group is tired.
Check standby pressure and the negative-control line for leaks before opening the pump.
Two numbers, five minutes: standby pressure (no function) and stall pressure (dead-head). Everything else follows from the gap between them.
A pump can hold pressure and still deliver half the flow. Measure litres per minute at rated pressure.
Load and unload a function and watch the pressure recover within one second. Slow recovery is a regulator, not a pump.
Three points that settle the argument about the cause: pump pressure, motor inlet pressure, and case drain.
| Reading | Where | Expected | Recorded |
|---|---|---|---|
| Pump pressure | TP1 | catalogue | |
| Motor inlet pressure | TP2 | catalogue | |
| Case drain | TP3 | ≤ 8–10 L/min |
A seal kit, a sub-assembly and a complete unit are three different prices for three different amounts of work. Ask for all three on the same sheet and decide with the downtime cost in front of you.
A regulator can be replaced on the machine. A rotating group cannot. The quote should separate the two, because the price difference is not small.
Ask for the price
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