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Old 12-05-18, 06:01 PM   #1
The wild eye
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Default OIl Pump not pumping

i Recently picked this little gear pump up with the intention of adding it to my R3MC but I cant get it to pump .

I have stripped and cleaned all over and fitted new gaskets . Is there trick to make them pump .





Steve
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Old 12-05-18, 06:29 PM   #2
Lofty76
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Hi Steve,

If its anything like the old Rover V8 pumps they won't pump if you drain all of the oil out, the trick is to pack them full of grease initially and then they are normally ok once they have picked the oil up.

Hope this helps

Regards

Lofty
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Old 13-05-18, 01:23 PM   #3
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I've been caught out by having the inlet and outlet mixed up. Flow goes around the outside of the gears, not through the mesh (It's not a mangle!). Also have your new gaskets opened up the end float of the gears so that its just leaking?

Good luck!

Dan
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Old 13-05-18, 01:41 PM   #4
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Quote:
Originally Posted by danthetangye View Post
Flow goes around the outside of the gears, not through the mesh (It's not a mangle!).

Dan
...I like that....
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Old 13-05-18, 05:23 PM   #5
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Are you sure it is a pump and not a motor ?
Is it turning in the right rotation ?
What condition is the pump interior ? Are there any signs of wear ?
What oil are you using ?
And finally, is there a PRV (pressure relief valve) on the outlet side (Not that it really matters, from the picture it looks like the outlet pipe is retained with a jubilee clip, so if the oil circuit does get blocked, the resultant pressure build up will blow the outlet pipe off before it cracks the pump)
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Old 13-05-18, 05:37 PM   #6
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The pressure setting screw and locknut appear to be on the RH side above the galvo elbow?


Last edited by ListerHA2; 13-05-18 at 05:45 PM.
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Old 13-05-18, 06:27 PM   #7
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Cannot say I have ever seen a pump with a PRV built into it like that, but I have seen motors with something similar, it makes a two way motor go slower in one direction.

A PRV usually is placed near to the pump outlet and when pressure builds up to whatever the PRV is set to, it dumps flow back to tank. It is like this because, whilst the oil is going over relief, it will get very hot and if that is the PRV built into the pump, it would 'cook' the pump and its seals.
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Old 13-05-18, 06:44 PM   #8
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Quote:
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Cannot say I have ever seen a pump with a PRV built into it like that,
There are plenty about in industry.
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Old 13-05-18, 07:24 PM   #9
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It is definately a pump ( I have had it in bits ) so not a motor .

The plumbing is exactly the way it was on the original machine and the relief valve , so I have not got them the wrong way round ( relief valve is on the inlet side though ).

It does not appear to have been taken apart before and reassmbled wrong by a previous owner .

It came from an old lawnmower engineers shop and was used to suck oil out of the mowers . the tank it is sitting on has got about a gallon of oil in it so it must have pumped at some time .


Steve
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Old 13-05-18, 07:39 PM   #10
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Quote:
Originally Posted by The wild eye View Post
( relief valve is on the inlet side though ).

It came from an old lawnmower engineers shop and was used to suck oil out of the mowers . the tank it is sitting on has got about a gallon of oil in it so it must have pumped at some time .


Steve
If it was only used as described the pressure setting valve would be irrelevant with both suction and discharge lines being open ended.
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