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Northwest Automatic Lubrication, Inc.

Trouble Shooting - SL-1 with QPC Controller

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SL-1 with QPC Controller Trouble Shooting Guide

INTERLUBE SL-1 with QPC Controller




NW Automatic Lubrication, Inc.  (888) 267-7695



  Trouble                    Possible Cause                   Test Procedure­           Remedy     

Pump does not work.

Blown fuse.

Test fuse.  Fuse is located on the left side of the QPC controller.  If defective replace with 5 amp fuse.  ----------------





Replace fuse.

Defective controller.

Press test reset button on the QPC controller.  If the LED windows do not cycle and start count check for power at on Power in and Ground  terminals.

If there is no voltage.------------


If there is voltage at Power in and Ground terminals and the fuse is good.  ---------------------


If controller LED’s are on and there is no power at pump-on or power-out terminals.  --------








Check power source.




Replace controller.




Replace controller.

Break in pump wire.

Check for voltage at the output terminals of the controller.  If voltage present, check for voltage at wire at base of pump.  If no voltage.------------

Locate break in wire and repair.  On units equipped with plug in connectors, check integrity of wire connector and plug in.


Defective pump.



Check for voltage at wire at base of pump  If voltage present and paddle not turning.

Replace pump gear-motor assembly at base of pump.


Improperly installed pumping unit.

There is voltage at wire at base of pump but pump does not turn.

Remove pumping unit and run pump.  If pump turns reinstall pumping unit making sure cam is correctly engaged.




Pump is turning but no output.

Air in pumping chamber.

Connect grease gun to reservoir fill point and start filling pump.  If grease takes time to start filling reservoir, air was in pump cavity.


Check reservoir over-flow tube if pump has been overfilled.  If plugged, may cause a vacuum and hold grease in reservoir.


Pumping Unit cavitating.

Fill pump reservoir






Remove reservoir lid and clean overflow tube.



Remove pumping unit and prime by hand or remove line from pumping unit and run pump until a bubble free flow of grease appears.


Reservoir empty.

Check reservoir level.


In cold temperatures check to see if grease is suspended in top of reservoir.

Fill pump reservoir.


Clean out reservoir and fill with cold temperature grease or grease of lower NLGI rating.


Pumping unit internal check valve not working.

Check pumping unit internal check valve by Installing 0 – 10,000 psi gauge on output of pumping unit. Turn on pump, pressure should reach approximately 4,000 psi at pressure relief if not.

Replace pumping unit.

Rotation of pump incorrect.

Pump is rotating counter clockwise.

Reverse wires at pump controller or power supply.


All lubrication points are dry.

See Note:

Pump is not working.

Check pump operation.

See:  Pump does not work.


Pump off-time interval is to long.

Pump is operating fine but to little grease is present at lube points.


Shorten off-time interval.

Pump on-time interval is to short.

Shortening off-time interval would over lubricate system.

Lengthen on-time interval.


Blockage in system.

Check for grease at pressure relief.

Refer to leakage at pressure relief.

Pump operating, no grease at pressure relief, all points still dry.

Remove line at primary block inlet and attach 0-10,000 psi pressure gauge.  Operate pump, if pressure does not reach 4,000 psi or relief pressure.


If pumping unit check valve is good check for leak in primary line.


Check pumping unit internal check valve.

Check on-time interval.




Repair leak.



If lubrication points have been dry for an extended period, purge system from the by-pass zerk fitting located on top of primary block or from top of each secondary block until sufficient grease appears at points.






Points are dry in one area.

Line from primary distribution block to secondary distribution block is leaking or broken.

Remove secondary feed line and cycle pump.  If no grease is present.

Repair or replace line.

Fitting is leaking at block inlet.

Check fittings for leakage.


Repair or replace fitting.


Single point is dry.

Broken line.

Check for leakage along line.

Repair or replace line.

Leakage at fitting.

Look at fitting.

Tighten or replace fitting.

Point not receiving enough grease.

Check integrity of line, if point is still to dry.

Contact Interlube representative for help.


Pump rotates slowly.

High pressure in system.

Check pressure relief valve for grease.  If no grease present, loosen each secondary block inlet fitting one at a time.  If pressure relieves at a fitting, check individual points for restriction.

Free up restriction at point. 




Extremely cold temperatures.

Check grease to see if hard.

Clean out reservoir and fill with low temperature grease or grease of lower NLGI rating.


Grease coming out of pressure relief.

Excessive pressure in system.

Place pressure gauge in-line with pump output line.  Locate area causing high pressure.

Repair area causing high pressure.

Progressive distribution system has a blockage.

If there is grease coming out of the pressure relief.  Start at the distribution block farthest from the primary block.  Loosen the inlet fitting and see if there is pressure.  If there is no pressure there is no problem in that block assembly.  Work your way back to the primary block until you locate the block with pressure at the inlet fitting.  If the block has pressure, re-tighten the inlet fitting and re-pressurize the system.  Loosen each line coming from the block.  If a line has pressure when loosened the blockage is at the end of that line.  If there is no pressure at any of the lines then the blockage is internal.

If the blockage is at the end of a distribution line, free up inlet to bearing.


If blockage is internal in the distribution block, identify and replace block segment with seized piston.


See:  Trouble shooting

A series progressive distribution block.








Contamination in system.

If distribution blocks are sticking repeatedly contamination may be present in system.

Clean distribution system or replace affected lines and block assemblies.

Contact your Interlube representative for more options.

Bearing point is blocked.

Check for high pressure in system using previous step.

Clear blockage in point.

Weak pressure relief valve spring.

Place 0-10,000 psi gauge at pumping unit outlet.  If pressure relief relieves at less then 4,000 psi.










Replace pressure relief valve.


Call Bernie for any further information.