Possible HD16DP acquisition
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=208258
Printed Date: 07 Nov 2025 at 12:44pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Possible HD16DP acquisition
Posted By: hdokes
Subject: Possible HD16DP acquisition
Date Posted: 21 Sep 2025 at 4:53pm
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Greetings all. Who knew becoming a land developer would find me owning such a variety of heavy equipment but here I am again with my potential acquisition of an Allis Chalmers HD16DP-7748. I do not know for certain but I am going to put this around the 1967/68 vintage. It's certainly larger than my D6. I went to check this bad boy out and it is in unbelievably great shape... everything works very well accept an issue with what I believe to be the transmission. The current owner explained that the unit would not move when he purchased it. Found the transmission dry... no fluid. They filled it up and that got it to moving. Over time it has retreated into a process of firing up the motor... than working the forward/reverse back and forth until the machine begins to move... initially it will move about 10 feet in both direction and then build up as you continue to cycle back and forth. Ultimately it will reach a point that it will move well for the day until such time you shut it down and let it sit. You then will have to repeat the process. I have ordered a complete set of manuals for it but do not have them yet. Thought I would look to see if there was an A-C old timer on here that could lend some pointers. I have posted this info in other tractor sites and have others telling me to run... don't walk... away from this purchase. Those that bother to explain why suggest parts are an issue. I'm finding it hard to even walk away from this. The unit is in very nice shape... all movements work very well accept the issue I spoke of above. My primary purpose for purchasing is the monster rake on the back and a 4 way blade. My current CAT D6 has neither and I am working a project that requires both. Any comments?  |
Replies:
Posted By: Eric B
Date Posted: 22 Sep 2025 at 8:50pm
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It sounds to me that a screen for the oil pick-up is restricted and while the oil is cold and thicker it's short of oil to maintain pressure. As the oil starts warming up and gets thinner there is enough flow to keep everything working. I've never owned an HD16DP so I can't give any details but just sharing this principle because it has been the scenario with other equipment at times. Please let us know when you find the fix, thanks. I have owned 13 bulldozers over a few decades. ------------- Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal! |
Posted By: HD6 Merv
Date Posted: 23 Sep 2025 at 10:55am
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Yes agree with previous poster; most transmission drive issues stem from transmission pump supply issues; and this applys to all crawlers and all makes. Blocked suction screens, collapsed suction hoses, suction air leaks etc. All just a prt of regular machine maintence. HD16DP was from all accounts a very good machine. Alot of parts as in all AC stuff 'can' be a issue; but alot of their engineering was standard SAE stuff too, not special just to 'me' stuff like cat can be at times. As in most machinery cases; alot of it depends on your/or your helpers, machinery 'nous' and abilitys ------------- tits tyres and tracks they all cost you money |
Posted By: Doughd16b
Date Posted: 23 Sep 2025 at 1:32pm
| I can help you out sir, too much to type,252 916 2927 anytime |
Posted By: Doughd16b
Date Posted: 23 Sep 2025 at 3:44pm
| Its a mid 1966 year model btw |
Posted By: hdokes
Date Posted: 05 Oct 2025 at 4:24pm
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Went down to where the HD16 is located yesterday and replaced the suction hoses on it. It looked like this could be the issue as the upper hose was not tight and could allow air to be sucked in to the pump but it did not alleviate the issue. Took a set of pressure gauges with me and checked pressure at the filter. Someone had already retrofitted this dozer with a relocated filter up next to the seat and we checked the pressure at that point. We had 160psi and found that the filter was clean and free of debris. Additionally, as we drained the fluid through the suction tube which is on the output side of the internal transmission screen and the fluid flowed freely and was absent of any contamination we believed the screen to be in good shape and did not drop the transmission pan to find out.
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Posted By: hdokes
Date Posted: 09 Oct 2025 at 7:09am
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Here is the latest... the current owner of the dozer removed the hose which goes from the modulating clutch to the torque converter, capped it and the port it came off of, however, we overlooked one crucial requirement... we were to take the hose going to the torque converter and connect it to the test port at the filter where we had 160 psi of pressure. So.... that hopefully will be accomplished tomorrow. We have been instructed to keep the rpms low when doing this test as if the torque converter is good it will go into gear like a transmission with a shift kit. The skinny here is if it does... then the modulating clutch is definitely suspect and needs to be interrogated. Fortunately, it sits right beside the seat and is easily accessible. Remember, on a test port on the modulating clutch we had no pressure at all. A tremendous thank you to Doughd16b for his assistance and guidance in this endeavor. It is very much appreciated.
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Posted By: hdokes
Date Posted: 10 Oct 2025 at 6:49am
| Woohoo!!! The eagle has landed! We have had success! Per Doughd16b's guidance, we hooked up the torque converter line to a pressure source and the dozer moved as it is supposed to in forward and reverse. Two things sit between the torque converter and the transmission filter... that would be the heat exchanger and the modulating valve. Figure there isn't much that can go wrong with a heat exchanger so will move forward with the purchase of this Goliath and tear into the modulating valve when I get it to it's destination. Very happy about this. Thank you Doughd16b! |
Posted By: Eric B
Date Posted: 10 Oct 2025 at 12:08pm
Thanks so much for posting this success report!! ------------- Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal! |
Posted By: darrel in ND
Date Posted: 11 Oct 2025 at 6:36am
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That's awesome. Love to hear success stories like that! Darrel |
Posted By: hdokes
Date Posted: 15 Oct 2025 at 6:41pm
Got it home in one piece this evening and couldn't wait... had to give it a go in the rock hard clay. I love the results!!! |
Posted By: hdokes
Date Posted: 15 Oct 2025 at 6:42pm
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Posted By: hdokes
Date Posted: 15 Oct 2025 at 6:49pm
| The ripper, while showing three tines, is actually capable of holding 5 tines. I'm thinking this is just the ticket for a subdivision development we are building where we have decided to use lime mixed into the soil to stabilize the road bed. I'm thinking this would/should be the first step after grading to prepare the soil for the lime. Thoughts on where I might look for a couple of matching tines? |
Posted By: Ray54
Date Posted: 16 Oct 2025 at 1:24pm
| Tractor junk yards. I could name 2 here on the left coast. But the closer to home the better. If you find nothing else try Fresno Tractor or F P Smith both Calif. Or General Gear in Id, or Gemdozer who comes here, but eastern Canada , French speaking. I know there is a yard in Missouri , not sure of name maybe Zimmerman. |
Posted By: hdokes
Date Posted: 17 Oct 2025 at 5:51am
| It's been suggested that I'd be better off leaving it with 3 tines. The 'ol girl does have a bit of age on her and it's my understanding that the final drives have a week point in them of potentially stripping the splines. Placing the additional tines on there may make her work a bit harder than she needs to be at this stage of her life. Thus far I have found the 3 tines to be doing an excellent job and I have never seen the scraper fill up the bowl so quickly as it is following behind as I rip. Expecting this to make a tremendous difference in moving all this soil. |
Posted By: hdokes
Date Posted: 17 Oct 2025 at 7:47pm
| Spent the better part of today addressing all the maintenance items on the HD16. Was very happy to see the slack in the tracks taken out once greasing the tension cylinder... on both sides. Let's hope it holds. No reason to believe at the moment that it won't. The zerks did require replacement as they didn't seal after greasing but new ones took care of that. Split a blade tilt hose (3/4") as I am certain the blade hadn't been tilted in a long time and there was no slack at the secure point to the cylinder and it got tugged on. Gave me a reason to break out the hose crimper and set it up on site so we have it from here forward. Tired of spending so much money on new hoses made up at other facilities. Have a Gates machine that I hadn't had set up in years. Looking to really go to town come Monday on the pond. |
Posted By: DMiller
Date Posted: 18 Oct 2025 at 5:22am
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Is a company here that adds stabilizing lime to soil on road projects, use a Rome Disc to cut it in as is faster than ripping. Zimmerman has a few odd AC machines but most are already stripped to scrap. Most all the midwest yards shipped off the remnants in the weeds back when steel hit $250/ton. |