Gx 345 Help!!!
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Thread: Gx 345 Help!!!

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    E.J.H's Avatar
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    Gx 345 Help!!!

    Hello all, My Dad has a 2004 GX 345 with 950+ hrs and the oil pressure light is constantly flickering. what could cause this problem?
    Last edited by E.J.H; 05-23-2017 at 07:35 PM.
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    Quote Originally Posted by E.J.H View Post
    Hello all, My Dad has a 2004 GX 345 with 950+ hrs and the oil pressure light is constantly flickering. what could cause this problem?
    Is the light flickering only at idle speed or all the time?

    First thing is to see if the engine actually has enough oil in it. If that checks out when was the last time it was changed? Changing it with the correct oil and filter would be next.
    Also check for a loose wire to the oil pressure sending unit.

    If this all checks out pull the oil pressure sending unit and install a mechanical oil pressure gauge. Then check out the pressure reading at idle and full throttle. Record the readings cold and hot.
    HydroHarold, raco232 and TJR345 like this.

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    E.J.H's Avatar
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    It flickers mostly at high rpm. It has 10w30 oil in it and we try to change it every year. Thanks in advance!
    1988 John Deere 316 50" Deck SOLD
    1952 Ford 8n SOLD
    1987 John Deere 318 46" deck 54" 2-way blade ---- SOLD
    1958 John Deere 420U project
    1940 John Deere B SOLD
    Kubota B6200E 2WD
    Except a man be born again,he can not see the Kingdom of God....

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    HydroHarold's Avatar
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    Quote Originally Posted by E.J.H View Post
    It flickers mostly at high rpm. It has 10w30 oil in it and we try to change it every year. Thanks in advance!
    Here's what I learned the last month when I did my regular bi-monthly generator test. It kept shutting down after running about 15 seconds. It turned out to be a faulty shutoff on the fuel line allowing gas to flow through the carb and down into the crankcase, the oil was as thin as water... Something else to check for your oil pressure light.
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    E.J.H's Avatar
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    The oil is not thin. could it be the sensor?
    1988 John Deere 316 50" Deck SOLD
    1952 Ford 8n SOLD
    1987 John Deere 318 46" deck 54" 2-way blade ---- SOLD
    1958 John Deere 420U project
    1940 John Deere B SOLD
    Kubota B6200E 2WD
    Except a man be born again,he can not see the Kingdom of God....

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    HydroHarold's Avatar
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    Repair Manual sez:

    Oil pressure @ slow idle (2050rpm) = 0.36 psi
    @ high idle (3550rpm) = 40.0psi

    Pressure relief spring bad, pressure relief ball valve defective, oil pickup clogged...?

    Very similar hours to my '04 and if it was happening to mine I'd go straight 30wt first and see what happens, quick check and just the price of the oil. Otherwise go with the good advice in previous posts for diagnosis. Pressure gauge replaces oil pressure sensor for test.

    Let us know!
    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..."

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    Check the connections on the back of the light.

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    Unplug 620 tan wire from the pressure switch if the light still flickers it would indicate a short to ground between the pressure switch and the bulb. If the light doesn't flicker with the switch unplugged it would indicate a faulty switch or that the oil pressure is actually dropping between 14.2 psi.
    HydroHarold and raco232 like this.

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    E.J.H's Avatar
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    Thanks i will try that!
    1988 John Deere 316 50" Deck SOLD
    1952 Ford 8n SOLD
    1987 John Deere 318 46" deck 54" 2-way blade ---- SOLD
    1958 John Deere 420U project
    1940 John Deere B SOLD
    Kubota B6200E 2WD
    Except a man be born again,he can not see the Kingdom of God....

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