Allis Chalmers HD4

Hi all haven't been on here in quite a while. I'm considering selling my dad's machine. It's sitting a ways from where I live but my brother has kept it running each year by starting it up. I have been told by my brother that one of the steering brake pedals had become seized somewhat presumably from sitting and not being worked. Should it be difficult in freeing this up (linkage possibly). In addition what type meaning how many electrical connections are involved in either replacing the ignition switch or removing to have a few new keys made. Another question question regarding cooling system, where might one find a slow leak (like over 3-6 months)in the cooling system from sitting and no apparent fluid seen under machine and oil level not affected (meaning figuring an engine to coolant leaking into oil).
 
Regarding the stiff linkages... what I find the best is generously applying penetrating fluid and then using an air chisel (with a blunt end) and the vibrations will free up the linkages quickly, just repeat the procedure and using foot pressure 'til all is well. To change the ignition switch you need to be careful that the functions at each position are the same unless you're able to get an exact replacement as the switch that was already in there. With a simple electric circuit tester you can confirm that you are doing it right. As for the coolant leak... it would have to be noticed if the machine is parked on a concrete floor. On any other surface, a leak can be hard to detect. It could be that a hose clamp or two need tightening up a bit. You don't say how much coolant is lost over the time period you mention but if it's very little and hard to find the leak I suggest you buy and put in radiator sealer made by "Wynn's" or "Extend" as they have an excellent product, it will not clog the cooling system.
 
There is no greasing zerk on the pedal cross shaft,get a squirt can and fill it with hydraulic oil,liberally lubricate the pedal where they pivot on the cross shaft and all the linkage,tie a rope to the pedal,press the pedal down with your foot and pull it back with the rope till you get the pedals free and liberally oil them again,you may be able to get a key from the AC dealer the key part #241977.
AJ
 
You don't say how much coolant seems to be lost. After the machine has been setting for an extended time, like before it gets started next time, try carefully "cracking" the oil pan drain plug. When it gets backed out to the last thread or two coolant will appear before oil if any is getting in the pan. It would be hard to tell if it was by just monitoring the oil level with the dipstick.
 
Thanks fer the suggestions and reply. I'll probably remove the key switch and have a locksmith key some new keys, as the one/s we had have been misplaced (something with age n not labeling what they're for I s'pose). As far as the coolant I'm unsure currently how much and how long it takes for it to go down will have to speak with my brother where it sits to find that out. Regarding the brake pedal, I'll probably have to remove floorboard to get at the linkage part to get at any place to lubricate, as I don't have a service manual. I'll utilize small acetylene torches too to maybe warm the pivot before oiling, and will look for the coolant sealer as well.It's parked on soft ground so it would make it somewhat difficult to see.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top