Greenmech safetrac low oil pressure.

[jmac]

When my safetrac is warmed up it cuts out when at idle, the display says low oil pressure! Could this be caused by a faulty oil pressure switch? Or worn oil pump? Or something else? What should I do ? Its the Isuzu engine.

[woody paul]

It could be an electrical fault, but when did you last change oil could be thin and a weak pump will affect pressure. 

[Jase hutch]

It could well be a faulty sensor, GreenMech used to sell a few when the Isuzu was the weapon of choice.

Try , just for test purposes , disconnecting the brown wire from the oil pressure switch , insulate the end of the removed wire then start the engine. If the problems gone then it’s a faulty switch or low oil pressure and needs checking out before the chipper is used.

The oil pressure from memory could be close to 100psi on cold start up , this would be on a new engine and I think the switch closes at 12psi ?

 I can confirm this from the Isuzu engine manual tomorrow..

Jase.

[jmac]

Thanks for the replies. I changed the oil recently and its at the correct level. To check the actual oil pressure am I right in thinking I should fit a gauge in place of the pressure switch? If the pressure is low fit a new pump? 

[Jase hutch]

Yes the gauge fits where the oil pressure switch is fitted , an 1/8 " bsp thread from memory..

Unfortunately if it's low oil pressure that's causing the problem it's not normally the case of just fitting a new pump , it's due to excessive wear throughout the engine..

Don't panic yet , could well be the switch..

Edited February 3, 2019 by Jase hutch

[jmac]

Thanks Jase, fingers crossed its the pressure switch, not got time for an engine rebuild at the moment ?.

[PeteB]

Top advice from the man who knows!!! Anyone seen this man at shows?

[openspaceman]

58 minutes ago, PeteB said:

Top advice from the man who knows!!! Anyone seen this man at shows?

No I've only met you at a show and spoken to Jason on the phone a couple of years ago and he is a top bloke.

[jmac]

Yeah arbtalk is great for picking the brains of someone with as much knowledge as jase ?. Not met jase but think I saw Pete b at the black isle show 2018?

[Jase hutch]

I've just checked and those pressure figures are correct .

New engine should be 70 psi on a cold start but could be over 100 psi..!!