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Cat D8H hyd pump whining, no power

kshansen

kshansen

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Central New York, USA
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Retired Mechanic in Stone Quarry
Jason merrick said:
I finally got time to pull the floor plates and ck the hydraulic pump for numbers. There were (4) #'s visible; 2720171, 2884865, 2919651, 2967488. I was expecting a single part #.
Click to expand...

I'm thinking those are cast in numbers on the end of the pump opposite to where it mounts to the engine, right? Actual pump numbers would be more like this format:

F3 - V 2010 - 1 F 13 S 3 S - 1 CC - 12 - L

And the pumps I used to work on had these numbers stamped in about the same size as the letters in this post so they can be hard to see.

To break down these numbers you can go to:http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/pll_1567.pdf

Problem with Vickers pumps is they can be configured in all kinds of ways, just unbolting the end cap and turning it 90º will make it a different part number.

To add another layer of confusion to this, even if you are able to read the stamped in numbers on a machine of this age there is no guarantee the housing the numbers are on is the original one for this application. I would be guilty of mixing and matching pump housings and internals many times over the years. Two bolt flange housing of a single section pump on a Hough 100 might have been used to build a double section pump on a Cat 988A, or the other way around. Not to mention converting a CW pump to be used in a CCW application. Hey you do what you have to to get the machine up in running for the next days production.

What I also will feel bad about is if I was still working at the quarry could probably lay my hands on everything to either repair your pump or even build one from scratch and all those parts will end up in a scrap trailer the next time some one gets the urge to neaten up the store room.
 
O

Old Magnet

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Here are the numbers for the pump.
Cat #9J5058 = 7J4634
Vickers # F10-2520VQ21A14S-112AC21L167 (two section pump)
Also a reference # 433279
I was thinking those numbers are reference numbers, I've seen them before, maybe an old numbering system?

Kind of lost track of the original symptoms here. OK, tank gets hot, how about the pump? Need one of those cheap infra red thermometers to shoot temperatures of the hottest spot. Going through the same diagnostics and problem on the ACMOC BB right now, only difference is pump is making noise and hydraulics are weak.
Need that pump pressure test. Current suspect on the other 46A is trash in the pilot operated main relief valve under the tank.
 
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Nige

Nige

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G..G..G..Granville.........!! Fetch your cloth.
Old Magnet said:
The triple valve arrangement for the 8S, 8U with tilt and adjustable 8D ripper originally is a #8S8666 and is replaced by arrangement #3P1198. Hopefully you can find some numbers on the pump to verify what you have but most likely you will be dealing with the replacement arrangement.
Click to expand...
Using 3P-1198 as the Arrangement Number leads me to a 7J-0612 Pump Gp. There are 2 types of 7J-0612 Pump - Type 1 & Type 2.

Type 1 pump uses a 7J-0573 38gpm cartridge + a 7J-0581 14gpm cartridge.
Type 2 pump uses a 7J-0573 38gpm cartridge + a 7J-7967 14gpm cartridge.

7J-0612 as a complete unit services to 9J-5050 Pump Gp or 422-8168 Classic Pump Gp.

This is all based on the assumption that the pump that is actually in the tractor is the one that's supposed to be in it according to the Parts Manual...........
 
O

Old Magnet

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Nige said:
Using 3P-1198 as the Arrangement Number leads me to a 7J-0612 Pump Gp. There are 2 types of 7J-0612 Pump - Type 1 & Type 2.

Type 1 pump uses a 7J-0573 38gpm cartridge + a 7J-0581 14gpm cartridge.
Type 2 pump uses a 7J-0573 38gpm cartridge + a 7J-7967 14gpm cartridge.

7J-0612 as a complete unit services to 9J-5050 Pump Gp or 422-8168 Classic Pump Gp.

This is all based on the assumption that the pump that is actually in the tractor is the one that's supposed to be in it according to the Parts Manual...........
Click to expand...

More numbers,
Cat #9J5050 = 7J0612
Vickers shows two numbers
3520V-38A14-13BB10-108L
3520V-38A11-13BB10-108L
 
Nige

Nige

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Check the cylinder barrel close-ish to the head end. There ought to be a data plate that gives the Group Part Number of the cylinder. If you can find that number post it here.

Failing that is there a Serial Number on the top RH corner of the back side of the dozer blade..?
 
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J

Jason merrick

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Oct 22, 2015
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Louisiana
I removed the blade cylinder today to replace the damaged cylinder Rod; hot it all apart to find that Cat shipped me the wrong rod for my application. Till, I get that cylinder repaired, I'm at a standstill as far as getting the pressure check done. I'll order the (2) clamps that connect the (2) sections of suction hardline.
 
O

Old Magnet

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I show the rod assy to be Part #5J2526. What did they ship you?
Big "U" blade should be a 45Kxxxx number. Check for stamped number if tag is gone.
 
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J

Jason merrick

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Louisiana
Hohhot, I found these (2) old rivet heads with no metal tag attached anymore. This blade tag was in the upper rt, backside of the u-blade. There was, however, a stenciled (stamping) there. Here it is: image.jpg
 
J

Jason merrick

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Louisiana
I always thought that an S blade was a straight dozing blade; I thought my D8 was wearing either a semi U, or a full Ublade.image.jpg
 
kshansen

kshansen

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Mar 11, 2012
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Location
Central New York, USA
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Retired Mechanic in Stone Quarry
Nige said:
Using 3P-1198 as the Arrangement Number leads me to a 7J-0612 Pump Gp. There are 2 types of 7J-0612 Pump - Type 1 & Type 2.

Type 1 pump uses a 7J-0573 38gpm cartridge + a 7J-0581 14gpm cartridge.
Type 2 pump uses a 7J-0573 38gpm cartridge + a 7J-7967 14gpm cartridge.

7J-0612 as a complete unit services to 9J-5050 Pump Gp or 422-8168 Classic Pump Gp.

This is all based on the assumption that the pump that is actually in the tractor is the one that's supposed to be in it according to the Parts Manual...........
Click to expand...

Well I played around in SIS and found this additional info:
The 7J-0573 cartridge that is used in both Type 1 & 2 crossed to a 1U-3953, then to 42600024 Classic or a OR-1505 Reman. Classic is approx. $282.00 Reman $516.00+core

The 7J-0581 and the 7J-7967 cartridges both cross to the same 3G-7658 and that crossed to 4260427 Classic or a OR1478. Classic is approx. $182/00 Reman $333.00+core
 
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