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Old 12-08-2012
LarryKehler LarryKehler is offline
Old Guy
Join Date: Jan 2008
Location: St Louis
Posts: 422
Default Kubota O-ring Replacement

The low sulfur diesel fuel got to my Kubota injector pump o-rings.
I had a continuous dripping of fuel from my pump. Mike McGragh posted
a replacement of one o-ring last year but was a little short on details.

Since more of the Kubota's are sure to start leaking, I decided to detail
my repair.
I went to the Kubota store to buy the o-rings and was told by the parts guy
that the injector pumps are not repairable. The pump must be replaced or
taken to a repair station for repair. I told the guy that one of our guys
had successfully replaced the o-rings and I just wanted to buy the o-rings.
He said they can not buy the rings from Kubota. He suggested I go to a pump
repair station to buy the o-rings. I went to NAPA and bought the only three
they had of that size. On the way to another NAPA I passed AutoZone and stopped.
AutoZone also had the o-rings.

You need two wrenches- 17mm and 19mm and a short piece of electrical tape.

1. Loosen the injector lines on the top and bottom. Just a few turns.

2. Remove the three line clamps.

3. Take the line loose from the Holder (#8 in Diagram). You may need both
wrenches to separate the line from the holder. Move line out of way.

4. Remove the holders. Because the holders are close together, I took the
outside holders first and the center holders second. Keep the parts identified.

5. Be careful not to drop the spring and washer if it comes out with the holder.

6. Remove the old o-ring. Put the tape around the threads to protect the new
o-ring when pushing it on the holder.

7. Two of the copper washers(#4 in Diagram) stayed in the holder and two remained
under the spring. I put them all back in the holder for installation. A drop of fuel
kept them inside the holder. Careful do not drop the washer into the pump.

8. The spring fits on the valve. The valve fits into an indent when centered.
Make sure they are centered before you install the holder with the new o-ring.

9. Reinstall all in reverse order. Do not tighten the lines on top at
the injectors.

10.Crank the engine until fuel comes out of lines on top. I cranked three
times for about a minute each before I got fuel out of all lines. Then
tighten the lines on top and start normally with preheat.
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Larry Kehler
94 WB40 WBDA "BAM"
St. Louis
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Old 12-08-2012
Rick's Avatar
Rick Rick is offline
Senior Member
Join Date: May 2009
Location: Bellefonte
Posts: 13,226

Nice write up Larry. Thank You
Rick Shawver
1SG Ret
2000 LX
Vise Grips
Bellefonte, AR
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Old 12-09-2012
markbragdon's Avatar
markbragdon markbragdon is offline
Senior Member
Join Date: Sep 2009
Location: Windham, ME
Posts: 1,269
Default Good job, Larry

All of the Kubota owners will need to do this eventually. Your write up will be very helpful. Thanks. Do you have the part number or size for the O rings that you used?
Mark and Donna Bragdon
CW4 retired
Windham, Maine
95 WB 42
2007 Jeep Wrangler
2015 GMC Acadia
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Old 12-09-2012
Fujimo Fujimo is offline
Senior Member
Join Date: Aug 2012
Location: Green Cove Springs
Posts: 483

Great job Larry! my personal opinion is also to use a diesel additive as this
will aid in pump lubrication. I buy mine at Walmart brand name Power
Service diesel fuel supplement gal does 250 gals cost about 17.00.
Paul and Lynette Brown
Green Cove Springs, Florida
1996 42' Wanderlodge
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Old 12-18-2012
Hunter Hunter is offline
Senior Member
Join Date: Oct 2008
Location: Spotsylvania
Posts: 86
Default O-ring part number

The Kubota part number for the o-rings is 04811-00150. I replaced all of the o-rings due to a leakage problem at the injector manifold. The original o-rings had paint on them and they looked like part of the fitting and would no longer hold a seal.
John Boudreaux
Spotsylvania, VA
2005 M450
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Old 12-18-2012
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cdamen cdamen is offline
Senior Member
Join Date: Oct 2010
Location: DeLand
Posts: 416

I made the mistake of buying my o rings from Onan. However mine are gold plated.
Chris and Roe Damen
DeLand, FL. 32720
1987 FC35 Sold
1973 GMC Motorhome
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Old 03-01-2017
73driver 73driver is offline
Join Date: Feb 2017
Location: Denver
Posts: 48
Default Replaced O'rings Yesterday

Thanks for the great post on changing out the O'rings. Followed step by step and worked like a charm. Napa couldn't cross reference the part number but called the Kubota dealer just down the road and they had them in stock. If anyone can get the Napa or Autozone cross reference that would be great.
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Jonathan Steen
Denver, CO
1993 WB40
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Old 03-01-2017
Neillynwood@aol.com Neillynwood@aol.com is offline
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Join Date: Sep 2016
Posts: 501

Seen ur text this morning was at the car sale last night congratulations on the fix
neil owens
1991 wb40
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