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Allis Chalmers Discussion Forum

allis hd ? questions

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08-21-2003 15:20:06

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father just got a crawler . the clutches & brakes work some when you first run it but as it warms up they go away. I pulled the filters on either side of the seat & they have some moisture in them as I was hoping that would be the problem.Is there a filter on the pump upfront on the bottom. where is the plug & fill for that system,& is it separete from the lift for the front blade as it goes away to. Also the two batterys are hooked in series (12v each) & there is a disconect for one ? I will try to firgure out what model it is next time I get over there. thanks for the help.

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08-30-2003 07:56:22

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 Re: allis hd ? questions in reply to steve, 08-21-2003 15:20:06  
I have found it to be a hd6. thanks for any & all help.

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08-22-2003 18:39:32

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 Re: allis hd ? questions in reply to steve, 08-21-2003 15:20:06  
im probably not much help if it is a smaller HD, i worked on the bigger units 20 years ago. they had a suction screen in the hose from the steering compartment to the pump. normally the screen was a canister type mounted to the side of the seat area. one hose from back end, one to the pump on the clutch (torque converter). the pump outlet went thru a different canister filter (high pressure can = steel) that had a filter inside to clean up the oil before it got to the steeering valve, located below the seat on top of the steering compartment. - all the bigger units are 24 volts. yes, both batteries are connected in series + from one batter to - of the next. use the other two terminals as supply ( - to ground, + to the shut off switch.) 1 switch kills all power.--- the hyudraulics were similar, but a different syste. you should have a seperate oil tank to one side of the seat. there may be a suction screen in the bottom where the hose bolts onto. there is definitly a high pressure can (steel pipe type) on the outlet of the pump. the hose out of the pump will go to the valve block under your left hand, below the seat/ arm rest. hope this helps, kind of generic not knowing the exact size unit. again i am talking about a HD 11 , 16, 21, etc. the very small 3 or 4 might be different. i dont think they ever shared the hydraulic oil and steering together, but the small ones might have.

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