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Randaleky 
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Joined: 17 Aug 2011
Location: belfry, ky.
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 Topic: shuttle pump
Posted: 04 Mar 2023 at 9:40pm |
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I have a problem with my HD 4 dozer shuttle pump that has quit putting any pressure out. the pump is installed at the end of the main Hydraulic pump. I tried to separate it from the Hyd. pump but seems to be stuck. I think the damage to the pump is the reason i cannot separate it from the other pump. I need some advice on what to do since I have never had this problem before . Any comments would be greatly appreciated.
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orangeman
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Joined: 12 Sep 2009
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Posted: 05 Mar 2023 at 12:49pm |
Randaleky: Lets start with a baseline and see if we can assist.
If memory serves the pumps are mounted in tandem on the operators left side of the engine. Oil from the 28 quart capacity hydraulic system is circulated by live, (engine driven pumps) read plural as in two pumps in tandem. A 25 gpm pump at 1625 psi and 2100 rpm is designed for use with Dozer - Backhoe - loader-backhoe and loader - ripper, while a 15 gpm pump at 1625 psi and 2100 rpm is provided for dozer applications.
How is your machine set-up with a loader/attachment or Dozer?
At the time of the problem developed did you have a weak shuttle response for and aft?
~ Orangeman
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orangeman
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Posted: 07 Mar 2023 at 11:28am |
Randaleky: Their is also a screen in the sump. Might want to verify that the screen is not plugged. The pump on the left side of the machine closest to the operator supplies hydraulic fluid to the Power Shuttle Clutch Valve. The Power Shuttle Clutch Valve assembly -located to the left of the operators seat - (contains a relief valve, a modulating valve, a pressure reducing valve, an accumulator piston and a closed center directional closed valve spool).
That said, the forward and reverse clutch pressure readings should be between 225-265 p.s.i. at high idle engine rpm's and a minimum of 150 p.s.i. at engine idle. Access to the port to read pressure should be to the left hand side of the steering levers. Removal of the floor plate will be required.
After your set up to read pressure, shift the power shuttle clutch control in forward and reverse ranges, with the transmission in neutral: after a momentary pressure drop, the gauge reading should be within the above noted p.s.i. range. Note: A pressure reading of 220 p.s.i. or less in either direction indicates leakage in the valve tubes or sealing rings to the forward or reverse clutch.
Source: Allis Chalmers Industrial Tractor Division Service Training
HTH's
~ Orangeman
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Randaleky
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Joined: 17 Aug 2011
Location: belfry, ky.
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Posted: 07 Mar 2023 at 3:59pm |
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Thanks for yur reply . I have a dozer and I pulled the pumps and removed the back pump from the4 Hydraulic pump which drives the shuttle pump. Upon examination the drive gear was spinning on the shaft because of excessive wear on the body causing the gear to seize and crack at one of the teeth. Th other gear is damaged to the point that turning the gear inside the chamber or body is locked up . minimal movement. I will need the entire ahuttle pump for the fix. I used to order parts from a dealer in I believe chicago or somewhere in Michigan but have lost the number. Any place that you know of that deals in the shuttle pump would be greatly appreciated. Lastly the hydraulic pump worked fine .thanks Randal
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orangeman
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Posted: 08 Mar 2023 at 7:35am |
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Randaleky - Sent you a PM. ~ Orangeman
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CAL(KS)
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Joined: 18 Sep 2009
Location: Chapman, KS
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Posted: 08 Mar 2023 at 8:18am |
take a look at minnpar.com
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Randaleky
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Joined: 17 Aug 2011
Location: belfry, ky.
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Posted: 08 Mar 2023 at 10:25am |
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THANKS i WILL
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Randaleky
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Posted: 11 Mar 2023 at 7:42pm |
I cannot find the pump anywhere at the present time. A salvage pump would be the only possibility right now . If anyone has one they would sell please let me know. thanks
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orangeman
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Posted: 12 Mar 2023 at 7:56am |
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Randaleky: can you supply the part number that is stamped into the coupling flange of the pump? ~ Orangeman
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Randaleky
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Posted: 15 Mar 2023 at 7:53pm |
part number AC 1003891 F75B I hope you can find something !
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orangeman
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Posted: 20 Mar 2023 at 8:27am |
Randal: My AC H-4 HD4 manual on page 158 shows p/n 0253271-1 as the rear pump assembly. This rear pump is shown in illustration 104-11. There is a reference in the AC parts catalog that says it replaces p/n 252568.
Given the above, please clarify that the part number of AC 1003891 F75B is the number stamped on the pump flange.
Also, were you able to contact any of the list of pump parts suppliers to discuss?
~ Orangeman
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Randaleky
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Posted: 20 Mar 2023 at 8:26pm |
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I have checked them and no pump , I will check the numbers you found and let you know , Calvin Schmitt had the main pump but I have not heard from him about the shuttle pump . Thanks Orangeman
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Randaleky
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Posted: 20 Mar 2023 at 8:29pm |
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also the part number I gave you came off of a parts machine HD 4 loader with D2200 diesel . so I thought it would be correct since I could not find any Numbers on the bad pump .
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Mark507
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Joined: 15 Jun 2023
Location: Minnesota
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Posted: 15 Jun 2023 at 3:14pm |
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Did you get your pump repaired yet? I just went through the same thing on mine. I can discuss my repair process.
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Codger
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Posted: 16 Jun 2023 at 6:24am |
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Had a similar problem with a commercial greens mower of an obsolete tandem mounted pump serving as a charge pump for the drive operation. I installed a blanking plate to the rear of the front pump eliminating the second pump mounting and installed a small belt driven pump at the front of the engine along with an external pressure relief valve. Worked well and not a lot to it.
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A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now.
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Tracy Martin TN
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Posted: 16 Jun 2023 at 9:02pm |
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Blount Equip in Hoboken, Ga. Ivan Summerix at Summerix Equip, Racine , Wis
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No greater gift than healthy grandkids!
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