Oil Pressure Light
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    52BW's Avatar
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    Oil Pressure Light

    I have a 2002 GX335 with a 20hp Kawaski engine. 1100hrs. Tractor runs great as it from day one. My oil pressure light starting coming on but the tractor runs fine. I changed the sending unit, oil, and filter. No light comes on until I mow about an hour or so. What is the oil pressure supposed to be on these engines? I have always maintained it well since new. Any thoughts or ideas will be welcomed. Thanks!

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    Quote Originally Posted by 52BW View Post
    I have a 2002 GX335 with a 20hp Kawaski engine. 1100hrs. Tractor runs great as it from day one. My oil pressure light starting coming on but the tractor runs fine. I changed the sending unit, oil, and filter. No light comes on until I mow about an hour or so. What is the oil pressure supposed to be on these engines? I have always maintained it well since new. Any thoughts or ideas will be welcomed. Thanks!
    I don't know what the oil pressure specification is but I'm sure it has one. On automotive engines the general rule is 10 pounds per 1,000 rpm.

    The other question is when the light comes on? Normally when the internal parts heat up they expand. This usually causes excess gaps between the parts allowing pressure to bleed out. Low pressure usually shows up first at idle speeds vs full throttle. This is when the oil pump is turning the slowest.

    Best thing to do is remove the sending unit. Then install a mechanical oil pressure gauge. Bring the engine up to temperature and record the readings. Then figure out if it is in specifications. Continuing to operate an engine with oil pressure problems will only cause more internal damage.
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    HydroHarold's Avatar
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    From my Shop/Repair manual:

    Kawasaki FH601V

    Hi Idle = 3400 RPM +/- 50 RPM

    Oil Pressure @ High Idle = 35/45 PSI


    Same engine as my 2004 GX335 w/940hrs. Great tractor with a great engine. Are you running multi-grade oil or straight grade 30 wt.?
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    52BW's Avatar
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    Oil Pressure sending unit

    Thanks guys for the come back and info. I get a pressure gauge from Amazon Thursday so I will check the pressure then and see what I have. I use John Deere 10W30 oil and filters and change both often, more than what's called for by mother Deere. It has been a great tractor 48C mower deck and 42 snow thrower. Thanks again for the help. I will report back the findings when I get my tester.
    Ray

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    Good luck and keep us posted on the results .
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    Check that oil pressure with a gauge as stated. Don't get nervous. I just went thru 2 bad oil pressure switches, new outta the box. 3rd one was good. Bad part was I just got done doing a total reseal of the engine! But oil pressure was fine. Had to warranty 2 oil pressure switches. Makes us look bad.

    Sent from my LGL52VL using Tapatalk

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    52BW's Avatar
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    Oil Pressure Light

    Hi!
    I am back with some not so good results, according to this gauge I got I have about half the oil pressure I need less than 30psi. I guess I will repair it as opposed to buying a new one as I use it to blow snow and my blower won't work on the new ones. I'll check around and explore my options. I thought I would get back with the results. Thanks for the help.
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    HydroHarold's Avatar
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    Really should have put this post at the end of your original thread, threw me off finding it again...

    You are running (35psi) which is factory spec minimum for that engine. If it were me and I needed to squeeze out some hours before repair... I'd switch to straight 30wt oil and see if there was some increase in pressure when hot. Worth a can or 2 of oil, maybe?
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    2013(12) 1026r TLB 54 QH front blade, 54D Auto Connect deck, ballast box, carryall

    '04 GX335, 48C, Johnny Bucket Jr., PowerFlow W/7bu. bagger, 42 snow blower, 48 Plow, JD front dethatcher, 10 Cart, Little-Brown Henway, Stihl 026P/20", Stihl 241/16", Stihl BG 85 blower, Stihl KombiMotor 110 w/string trimmer/brush cutter/edger/pole saw/hedge trimmer, Snapper 21" WB, Snapper 8/24 snow blower

    "...and visions of green CUT sugarplums dance in his head..."

    NRA Life Member

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    52BW's Avatar
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    I will give 30wt a try tomorrow and see what that does.

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    xcopterdoc's Avatar
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    Did you check the pressure at wide open throttle or idle?

    Sent from my LGL52VL using Tapatalk
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