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Cat d8h parts search

Bluox

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Jun 19, 2010
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1,960
Location
WA state
You don't want to use a thicker cutting edge as you will lose cutting action.
The 4T-6531 edges are the right ones for your blade.
You should be able to change any of the blades or end bits without changing the others.
Clean the blade and the back of the new blades with your grinder
Make sure you tighten the new bolts tighter than you think they need to be..
Block the blade up so it won't mash you.
Be careful.
Check you fan belts and wash out the radiator .
if you have a reversible fan put it on push.
check the water every time you start the tractor.
Good luck
Bob
 

56wrench

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Joined
Dec 4, 2016
Messages
2,074
Location
alberta
Usually when the fuel pressure gauge is running below the green zone, the fuel filters need changing. Other than regularly changing them, thats how you know they are starting to get restricted.
 

Bluox

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Jun 19, 2010
Messages
1,960
Location
WA state
Usually when the fuel pressure gauge is running below the green zone, the fuel filters need changing. Other than regularly changing them, thats how you know they are starting to get restricted.
That tractor should have a screen in a metal bowl in the fuel line right before the pump.
The nut on top 15/16s. dump the bowl and blow out the screen.
Turn the fuel off under the right side of the fuel tank.
There is a drain plug right below the filters will drain the sludge in the filter housing.
after you change filters open the fuel tank and the wheel on the top of the filter housing and the filters will self bleed if the tank is mostly full.
Bob
 

Welder Dave

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Oct 11, 2014
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12,257
Location
Canada
Usually you get what you pay for but sometimes OEM prices are out of this world. The Cat dealer here wanted $1200 for a new 3204 water pump no exchange. That is kind of crazy.
 

Lindsey97

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Joined
Dec 5, 2010
Messages
173
Location
oklahoma
Usually you get what you pay for but sometimes OEM prices are out of this world. The Cat dealer here wanted $1200 for a new 3204 water pump no exchange. That is kind of crazy.
I bought a water pump for my D4c about 10 years ago from cat, think it was $400.

Replaced one on my 455G crawler, it's the earlier version with belts instead of serpentine, it was $800. If it were the later serpentine version cost would have been less than $250. Go figure.
 

Lindsey97

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Joined
Dec 5, 2010
Messages
173
Location
oklahoma
That tractor should have a screen in a metal bowl in the fuel line right before the pump.
The nut on top 15/16s. dump the bowl and blow out the screen.
Turn the fuel off under the right side of the fuel tank.
There is a drain plug right below the filters will drain the sludge in the filter housing.
after you change filters open the fuel tank and the wheel on the top of the filter housing and the filters will self bleed if the tank is mostly full.
Bob
Thank you for the advice. I'm slowing working my way thru this tractor. Working on a septic system install, too hot to go mess with D8 after that.
 

Lindsey97

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Dec 5, 2010
Messages
173
Location
oklahoma
Usually when the fuel pressure gauge is running below the green zone, the fuel filters need changing. Other than regularly changing them, thats how you know they are starting to get restricted.
I never thought of that, I do have an operator's manual, I bet it's in there.
 

nicky 68a

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Apr 14, 2013
Messages
1,159
Location
england
Like I said before,here in the UK we refer to your blade as an 8S blade.I note that Cat describes it as an 8S too in a previous post in this thread.
I’ve owned 12 of these 46A/68A D8’s all with 8S blades as in the op’s picture.
If I recall,my D8H parts books offer up 8A 8C 8S 8SU and 8U blades,same for D8K’s.
However,my later hidrive D8’s,they seem to designate their 8S blades as 8SU
 

Bluox

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Joined
Jun 19, 2010
Messages
1,960
Location
WA state
Like I said before,here in the UK we refer to your blade as an 8S blade.I note that Cat describes it as an 8S too in a previous post in this thread.
I’ve owned 12 of these 46A/68A D8’s all with 8S blades as in the op’s picture.
If I recall,my D8H parts books offer up 8A 8C 8S 8SU and 8U blades,same for D8K’s.
However,my later hidrive D8’s,they seem to designate their 8S blades as 8SU
In the 90s Cat changed calling their semi-u blades straight blades .
The D-7 is the biggest tractor to have a true straight blade none of the bigger tractors did.
If you have any old One Safe source books or Cat Performance Handbooks from the late 90s on take a peek.
The 29E blade is now listed as a 8SU blade.
Bob
 

Lindsey97

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Joined
Dec 5, 2010
Messages
173
Location
oklahoma
Been pushing up topsoil and having a good time running the D8. I'm in the process of changing filters and ran into something weird with the primary fuel filter housing. previous owner welded up the bottom of the primary bowl, pn 8H-2810, so I'm replacing it along with the nut, 8H-2807. My question is about the threads. Got new parts in, and they won't thread together, even with new nut. Old parts were somewhat difficult as well, but still in use. I tapped and chased threads after galling up and it's a no go. So returning new parts. Threads seem to be 3/8-24 nf. Anyone else ever experienced this?

Also replaced the fuel pressure gauge, and after changing and flushing secondary bowl, I think my fuel transfer pump is shot due to contamination and primary filter being improperly seated inside thus stuff getting by. Dozer runs good even with low fuel pressure, starts well, but new gauge has started fluttering. So after reading service manual, I'm guessing it's time for a new fuel pump, or maybe the bypass valve is stuck partially open.

Where is the bypass valve and is it easy to get to? Thoughts?
 

nicky 68a

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Apr 14, 2013
Messages
1,159
Location
england
Could you get pic of the pump please.
If it’s the later compact fuel pump,they have a tendency to flutter when they are worn out.This affects your pressure gauge as you describe,but can happily run like that for years without particularly affecting performance.
It can get expensive replacing the horseshoe,shaft and plungers etc.
The older style big fuel pumps were bomb proof in my experience,but the smaller compact ones were abit less tolerant to wear and tare
 

Lindsey97

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Joined
Dec 5, 2010
Messages
173
Location
oklahoma
Horseshoe, shaft, and plungers? I've found 2 aftermarket fuel pumps on ebay, seller is globalpartszone, would appreciate help picking which one is correct. called cat dealer this morning, gave serial # 46A13057, they gave part number 2564756, cost of $1,541.27. Ebay pump is $207.00
 

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Bluox

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WA state
He's mumbling about a whole fuel injection pump not a transfer pump.
Clean the dirt off and remove the fuel line ,2 3/8 bolts and the pressure relief valve is in there .
ask Cat about a yellow mark pump.
Bob
 

nicky 68a

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Messages
1,159
Location
england
Sorry,I thought you were on about the whole injection pump causing the fuel pressure issues and fluttering about.
My bad.
You’ve got the older style pump and I’ve used a non Cat transfer pump in the past at a cost of £100 or so with no problems whatsoever.
Go with the e.bay item
 

nicky 68a

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Apr 14, 2013
Messages
1,159
Location
england
He's mumbling about a whole fuel injection pump not a transfer pump.
Clean the dirt off and remove the fuel line ,2 3/8 bolts and the pressure relief valve is in there .
ask Cat about a yellow mark pump.
Bob
My apologies for mumbling.
 

Lindsey97

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Dec 5, 2010
Messages
173
Location
oklahoma
I heard no mumbling. I've been working 7 days/week so I probably uttered some mumbling lol. I picked the $364 transfer pump on ebay, pn matches what cat dealer gave me, 2564756. I suppose I need a gasket as well. Thanks for the help.
 

Lindsey97

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Joined
Dec 5, 2010
Messages
173
Location
oklahoma
He's mumbling about a whole fuel injection pump not a transfer pump.
Clean the dirt off and remove the fuel line ,2 3/8 bolts and the pressure relief valve is in there .
ask Cat about a yellow mark pump.
Bob
Please specify which 2 bolts. Is the bypass valve inside the fuel pump? Is it the 2 bolts on the side of the pump in my pics?
 

Lindsey97

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Location
oklahoma
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Got the 2 center edges off today, used my 1" air gun. Did not have to cut a single nut, never had that happen before. Did however have to trim the inside edges of the end bits with the gas axe. Is that normally how it's done? I never had to trim cutting edges before either. I'm thinking a previous owner installed aftermarket or 69E edges on my 29E blade.

Doing the fuel pump tomorrow.
 
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