Construction and other equipment

Print Page | Close Window

HD4

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=120322
Printed Date: 27 Jul 2025 at 3:06pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: HD4

Posted By: Glen S.C.
Subject: HD4
Date Posted: 13 Mar 2016 at 6:41pm

Got my loader home . The guy had told me that it was knocking and thought it was the front main . I bought it knowing of an engine problem . When we unloaded it I noticed no oil pressure .(has gauge installed ) Took it to my shop removed the oil line and put in my test gauge and no oil pressure . Should I pull the pan and then the pump or is there something else to check .Maybe Ivan could help if parts are needed.

Replies:

Posted By: Randaleky
Date Posted: 13 Mar 2016 at 9:31pm

with no oil pressure, I would say the damage is already done. spun bearings, etc.

Posted By: pinball
Date Posted: 13 Mar 2016 at 10:59pm

Running a diesel or gas engine loading a crawler, unloading a crawler, running in into your shop and there is not a very loud knock or it hasn't locked up doesn't sound quite right. I suspect you have some oil pressure. randall is probably right as you have blew a seal or maybe a bearing which would allow the oil pressure to drop quite a bit. running it may cause some real serious damage. course we cant here how loud the knock is. may be a stupid question but is the oil pan full up to the full mark on your dipstick. you also should be able to remove the oil line at the block and make sure its not plugged and turn the motor over, don't start it, just turn it over to see if any oil comes out. If you have oil coming out of it change the filter and oil then try it. Having said all this if its a loud knock then just pull the pan for inspection. good luck

Posted By: orangeman
Date Posted: 14 Mar 2016 at 7:18am

Glen - Where did you install the test gauge at the remote end of the tube where the instrument cluster is located or close to the engine?

If the oil pressure system relies on a oil feed tube to the gauge, recommend you plum your test gauge as close as you can to the oil pump thus eliminating the oil feed tube as a possible leak source as a first order of business.

Keep us posted with more questions as you progress - Good Luck!

Orangeman

Posted By: Glen S.C.
Date Posted: 14 Mar 2016 at 5:26pm

I hooked the gauge in on the side of the block where the oil pressure sending unit should be.(right side behind injector pump) As far as the amount of oil it is over full . When it started to knock he says he shut it down . His mechanic told him to add an extra gallon of oil to get it to his barn . He told me it had not ran until we loaded it . I did not here it run before I purchased it . I bought it knowing it would need a rebuild .I was just wandering if there was something else there was to check that I missed . I guess the next step is pull it out and tear her down . Thanks Glen

Posted By: orangeman
Date Posted: 14 Mar 2016 at 6:30pm

Glen: How many hours on the unit? Sounds like time to pull the block for R and R.

Posted By: pinball
Date Posted: 14 Mar 2016 at 6:51pm

Sounds to me that you have a good handle on it. good luck norm

Posted By: pinball
Date Posted: 14 Mar 2016 at 6:56pm

FYI I believe the only difference between gas and diesel is the head and fuel pump. Block, pistons are the same. norm

Posted By: Glen S.C.
Date Posted: 14 Mar 2016 at 7:18pm

Did what pinball said no oil in fitting no oil comes out when it spins over . Is there some way that passage could be blocked. Not sure about the hours meter is unhooked. The previous owner said it had been rebuilt 2 years before he got it. He said it would not pull in first gear and they rebuilt the tc .When I go to pick it up he said it was not tc it was the reverser . By what he said he bought in parts I think it was reverser . He said it took 2 years to do this . After that it was ran about 1 year before this started. Now he was the owner he has a mechanic , not sure of his ability, but that's the story. Tear down here we go. Thanks Glen

Posted By: pinball
Date Posted: 14 Mar 2016 at 10:50pm

If you have some oil coming out then it would seem that maybe a seal or rod bearing failure which would reduce the oil pressure but If you have no oil at all I would suspect oil pump failure. on the left hand side of the seat there is a lever. Its a shuttle valve for the torque converter for forward and reverse. takes type a transmission fluid. dip stick is down by the right foot. I actually had a problem with mine on the power issue until I discovered it was in a higher gear. once I got it into 1st gear power there was no problem. Not sure if you can pull the pan without taking the engine out or not. others can tell you that. I suspect if you get the pan off you probably will find an oil pump problem. the damage beyond that is unknown but you will have to pull the bearing caps off the check the bearings and probably should replace the seals while your at it. anyway it sounds like you know what you have to do. there is some people on here that knows a lot more than I do so and I think they will help you if you should run into problems. Good Luck

Posted By: Dozer
Date Posted: 15 Mar 2016 at 7:48am

Before I attempt to run a machine that has not been run for years I charge the system with fresh oil. I use my portapower filled with fresh engine oil attached to the oil pressure gage port. On my HD6 I removed the oil pump and pressurized the system at the point where the oil pump would.

Posted By: Randaleky
Date Posted: 15 Mar 2016 at 11:39am

I think you can drop the belly pan cover and be able to take the oil pan off to inspect the oil pump, and crank rod caps for slack etc.