Simran RPU80 Fault Tracing, Pump motor is not running/not responding to rudder command

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Fault tracing

7 FAULT TRACING

If fault develops, the source and location must be traced. Close all stop cocks to the pump unit and check whether the steering gear functions normally using only the steering wheel pump. If so, then the fault is most probably in the pump unit or junction unit/autopilot computer.

The following faults may be tested for:

7.1Pump (motor) is not running/not responding to rudder command

Probable reason:

Brushes sticking or worn out. Remove the brushes and check. Sticking brushes should be wiped clean and any carbon dust should be removed from the brush holders. Check that the brushes move without restraint before they are secured.

7.2The piston rod does not move with rudder commands

Probable reason:

1.Check that the stop cocks are open.

2.The pump is sucking air. Check outlets A, B and C for leakage. If the fault is not found here, check the non-return valves for leakage, especially the copper gaskets between the end plug and the valve housing.

Leakage may also occur in the threads of the suction valves grub screws (21). Check both. If leakage is present, the pump unit has to be dismantled. See paragraph 7.10 for dismantle and cleaning of the suction valves.

3.See also paragraph 7.10.

7.3Excessive noise from the pump unit

Probable reason:

1.Air in outlet C to expansion tank. Ensure that the stop cocks are open, if so, loosen the nut on the coupling and check that the oil is flowing normally.

20220422N

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Contents Simrad RPU80/160/300 Reversible Pump Copyright 20220422N Document revisions Contents Technical Specifications General Introduction20220422N HC HYDRO-CONTROL German RPU160 RPU300 BCS ItalianBosvik Norwegian Capilano, Flexatrol Canadian. See Seastar Harmek NorwegianLecomble & Schmitt France RPU160 RPU300 HynauticSeipem Italian RPU160 RPU300 Lecomble & Schmitt Old modelsVetus Dutch RPU160 RPU300 Servi NorwegianSLEIPNER, Hydrive Norwegian Teleflex See Seastar Tenfjord NorwegianWagner Canadian RPU160 RPU300 VetusCalculation of cylinder volume Minimum rudder time adjustmentMeasurements and Calculations for Applying the RPU Capacity nomogram for Reversible Pump RPU80/RPU160/RPU300 Construction Description of RPU80/RPU160/RPU300Principle of operation ref. -1 and figure Suction valves on outlet C Valve blockGear pump Pressure operated non-return check valves on outlet a and BPipe connections Mechanical Installation InstallationInstallation of pipes Connection to expansion tank Connection to hand hydraulic steering gear J3000X, J300X, J300X-40, J50, J50-40 AC10, AC20, AC40 Electrical installationPreparation and Testing TestingOil filling and bleeding Maintenance DismantlingElectric motor Excessive noise from the pump unit Fault TracingPump motor is not running/not responding to rudder command Piston rod does not move with rudder commandsPiston rod of the rudder cylinder does not move smoothly Steering wheel is turning while pump unit is operatedSmall and sudden heading changes while on automatic steering Activator reduces the hardening time to 1 hour Rudder moves only in one direction with pump runningSpecifications Technical SpecificationsDimensions RPU80 performance RPU300 performance RPU160 performanceSpare Parts RPU80/RPU160/RPU300Pos Qty Gear pump parts Parts for Fracmo motors Motor parts LemacPos Qty Gear pump parts Previous RPU80 model RPU80 Previous model gear pumpEurope Sales and Service Worldwide