Roland S

  • Posts: 368
oil for pressure washer? (gx390 and pump)
« on: April 11, 2013, 07:31:21 pm »
hi

i'm giving my pressure washer a service honda gx390 and ww965 pump. it6 says 10w30 oil, should this be mineral oil, synthetic, part synthetic? and i apparantly need 30w oil for the pump any idea where i can buy that cheaply? i'm changing the spark plug and air filter also, anything else i should be doing?

thanks in advance

Blast Away

Re: oil for pressure washer? (gx390 and pump)
« Reply #1 on: April 11, 2013, 07:39:44 pm »
I just bang engine oil in ours. Not sure what the number is but it goes in the van too!

Rob_Mac

Re: oil for pressure washer? (gx390 and pump)
« Reply #2 on: April 11, 2013, 07:59:33 pm »
Ain't it 15 40 for the engine and 10 for the pump.

Maureen will be along in a minute to give you the correct algorithm ;D

Rob ;D

chris scott

  • Posts: 3414
Re: oil for pressure washer? (gx390 and pump)
« Reply #3 on: April 11, 2013, 08:04:08 pm »
15/40 ish for the engine from any hire shop and straight 30  for the pump .
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Rob_Mac

Re: oil for pressure washer? (gx390 and pump)
« Reply #4 on: April 11, 2013, 08:05:59 pm »
I want none of those pikey ways on Saturday ;D ;D ;D

Rob ;D

AshWhite

  • Posts: 3427
Re: oil for pressure washer? (gx390 and pump)
« Reply #5 on: April 11, 2013, 09:07:27 pm »
Aldi were selling 30weight oil for about £3/litre last week, not sure if its still there.
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Roger Oakley

Re: oil for pressure washer? (gx390 and pump)
« Reply #6 on: April 11, 2013, 09:18:02 pm »
hi

i'm giving my pressure washer a service honda gx390 and ww965 pump. it6 says 10w30 oil, should this be mineral oil, synthetic, part synthetic? and i apparantly need 30w oil for the pump any idea where i can buy that cheaply? i'm changing the spark plug and air filter also, anything else i should be doing?

thanks in advance

Check valves on the pump, and don't use cheap oil you'll regret it in the long run.

BDCS

  • Posts: 4777
Re: oil for pressure washer? (gx390 and pump)
« Reply #7 on: April 11, 2013, 09:26:44 pm »
Engine oil 10-30 I use semi from costco - I use light gearbox oil which is what I use in my bike. I also change the valves and unloader every year

Roland S

  • Posts: 368
Re: oil for pressure washer? (gx390 and pump)
« Reply #8 on: April 11, 2013, 10:12:00 pm »
thanks for all the advice  :), the cheap motor factors locally don't seem to have 10w30 (i think because its a motorcycle grade?) so i'll have to get it from halfords, they have castrol semi synthetic 4litres for £26 which seems ok for decent quality oil http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_263351_langId_-1_categoryId_165507

the pump oil it says SAE 20w30 but struggling to find that.

what do you check for when looking at the valves on the pump?

as far as the unloader, i was told they pack up a lot so i don't bother using it all my lances and fsc have the triggers permantly held on with cable ties.

BDCS

  • Posts: 4777
Re: oil for pressure washer? (gx390 and pump)
« Reply #9 on: April 11, 2013, 11:32:56 pm »
thanks for all the advice  :), the cheap motor factors locally don't seem to have 10w30 (i think because its a motorcycle grade?) so i'll have to get it from halfords, they have castrol semi synthetic 4litres for £26 which seems ok for decent quality oil http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_263351_langId_-1_categoryId_165507

the pump oil it says SAE 20w30 but struggling to find that.

what do you check for when looking at the valves on the pump?

as far as the unloader, i was told they pack up a lot so i don't bother using it all my lances and fsc have the triggers permantly held on with cable ties.

Do you mention this in your rams ?

Roger Oakley

Re: oil for pressure washer? (gx390 and pump)
« Reply #10 on: April 12, 2013, 01:17:53 pm »

what do you check for when looking at the valves on the pump?

as far as the unloader, i was told they pack up a lot so i don't bother using it all my lances and fsc have the triggers permantly held on with cable ties.

You are not serious about the cable ties?
Re the valves
You are looking for any where & tear, they show travel with a little bit of resistance, how long you had the machine and how much work has it done? might just be better change the valves anyway.

Roland S

  • Posts: 368
Re: oil for pressure washer? (gx390 and pump)
« Reply #11 on: April 12, 2013, 02:34:16 pm »
its had a fair bit of use and i bought it 2nd hand. as far as the cable ties, yes i am serious, the guy i bought it off told me it was recommended, as the unloader valves fail regularly. to be honest it's mainly residential i do and i don't have the public walking around while i'm working, so i don't consider it to be that unsafe. but clearly i'm in a minority there lol.

Roger Oakley

Re: oil for pressure washer? (gx390 and pump)
« Reply #12 on: April 12, 2013, 02:45:01 pm »
Ok not going to go there about the cable ties,
Anyway for your machine I would do the following,
Change both oils, engine & pump,
Change air filter
New set of valves in pump,
Check the Fuel sediment (tap) trap for any crap from the fuel tank.
If unloader is ok and working then leave it but it wouldn't hurt to change it, keep that one you have a last resort spare.

That's about it for a basic service to that machine

Rob_Mac

Re: oil for pressure washer? (gx390 and pump)
« Reply #13 on: April 12, 2013, 02:59:59 pm »
All the machines I have had and still have and I have never replaced an unloader valve!!

Rob ;D

Roland S

  • Posts: 368
Re: oil for pressure washer? (gx390 and pump)
« Reply #14 on: April 12, 2013, 03:56:02 pm »
Ok not going to go there about the cable ties,
Anyway for your machine I would do the following,
Change both oils, engine & pump,
Change air filter
New set of valves in pump,
Check the Fuel sediment (tap) trap for any crap from the fuel tank.
If unloader is ok and working then leave it but it wouldn't hurt to change it, keep that one you have a last resort spare.

That's about it for a basic service to that machine

thanks for the advice, who do you recommend for buying the valves from?

Roland S

  • Posts: 368
Re: oil for pressure washer? (gx390 and pump)
« Reply #15 on: April 12, 2013, 03:57:46 pm »
All the machines I have had and still have and I have never replaced an unloader valve!!

Rob ;D

that's interesting, i've just checked and they don't seem really expensive anyway, so maybe i will start using it.

Roger Oakley

Re: oil for pressure washer? (gx390 and pump)
« Reply #16 on: April 12, 2013, 04:10:11 pm »
Ok not going to go there about the cable ties,
Anyway for your machine I would do the following,
Change both oils, engine & pump,
Change air filter
New set of valves in pump,
Check the Fuel sediment (tap) trap for any crap from the fuel tank.
If unloader is ok and working then leave it but it wouldn't hurt to change it, keep that one you have a last resort spare.

That's about it for a basic service to that machine

thanks for the advice, who do you recommend for buying the valves from?

Interpump spares can be got from ebay if you have to or Tech-Clean, or I can give you my service guys number has he'll have them in stock.

Roland S

  • Posts: 368
Re: oil for pressure washer? (gx390 and pump)
« Reply #17 on: April 12, 2013, 04:22:22 pm »
well techclean is where the washer came from originally so i'll speak to them. thanks

BDCS

  • Posts: 4777
Re: oil for pressure washer? (gx390 and pump)
« Reply #18 on: April 12, 2013, 05:51:42 pm »
If you cable tie the trigger open then why bother with an unloader at all ?

Roland S

  • Posts: 368
Re: oil for pressure washer? (gx390 and pump)
« Reply #19 on: April 12, 2013, 06:38:24 pm »
If you cable tie the trigger open then why bother with an unloader at all ?

errr because it came with one fitted? and as i said earlier if they're more durable than i had been led to believe i'll start using it.