Caterpillar D25C Dump Truck

Does anyone have experience with these kind of dump trucks? How do they compare to the articulates? Can they only travel on hard surface roads? Can one still find parts for them? Thanks

Old machine by now. They were very good when they were new. Would go anywhere and were inconvenient to work on till you figured out the trouble spots. Center hitches, front suspension and brakes. All Cat components, so parts should not be a problem. Condition is everything.

Everything John C said above, plus..........

For the older models (not sure if this is one of them) there is not a lot of information on the Caterpillar online parts/service system. Everything parts or service-related seems to be in the form of paper manuals. These come up quite regularly for sale on eBay UK, because all the artics are built in UK and that was where most of the early ones were sold. To check whether online info is available for the particular truck you are interested in would require a Serial Number or at the very least the S/No prefix. The only D25C model that appears in Caterpillar SIS is the 9YC-prefix machine.

Availability of parts from a Cat dealer would not necessarily be a problem, it's finding the Part Numbers that could well prove to be the challenge. The dealer parts people will simply give you a blank look if the information isn't in the online database.

Thanks for this. This is what is stamped on plate from picture on the auction site. 7U0640 10 4154.

James Sorochan said:

Thanks for this. This is what is stamped on plate from picture on the auction site. 7U0640 10 4154.

Click to expand...

9U0640 is the Part Number of the front chassis. This chassis is used in various early artic models including the D25C
Can you ask the auction company for the machine Serial Number or do you have a link to the auction.?

EDIT: Found the auction. The plate in their photo is definitely a Part Number plate, not a Serial Number. If they can't come up with a machine S/No then ask them if there is one on the engine. It looks as though the engine data plate is in photo #15 right above the exhaust pipe.

Thanks Nige. I'll call them tomorrow and ask for info. on the unit.

James Sorochan said:

Thanks Nige. I'll call them tomorrow and ask for info. on the unit.

Click to expand...

The engine serial number should be a 7JB or a 13Z on a 3306 DI engine.
Bob

Got the serial numbers. There are two of these units in the sale.
9YC00844 and 9YC00736. I talked to a mechanic today that helped clean them up for the sale. He said they seemed to be in good shape execpt one of them has some slipping between 2nd and 3rd gear. He can't remember which unit. What would be the procedure for finding out which one has the slipping tranny? He suggested pulling out strainer on transmission to see if there is any contamination. I will talk to the auction rep to see if one can test drive the units. The auction is in late November so that may give us some time to figure things out. Any help would be appreciated and thanks to everyone so far.

For 9YC machines parts & service information is all available online, so no hunting for paper manual unless you specifically want to have them.

FWIW a large local highway contractor has a D25D they use on highway projects all the time. They have enough $$ and work to use whatever they want so the old girl is pulling her weight.

I'd love to find one in good shape at a decent price.

Good luck!

Sometime in the early eighties a small coal mine that I worked at bought one of the first units in this state. In those days it was a basic DJB and not a Cat. It allowed us to mine all year around. Although it carried the same amount of material as a highway truck, the all wheel drive and large tires and power shift transmission just didn't break down and would pull the steep slopes with ease. The maintenance learning curve was a little steep but the machine was impressive. It was the vision of someone outside of the Cat system who saw the potential in the design and took the risk to actually build it. Then Cat bought out that company?

John C. said:

It was the vision of someone outside of the Cat system who saw the potential in the design and took the risk to actually build it. Then Cat bought out that company?

Click to expand...

That's exactly what happened. DJB did a deal with Cat to supply components to equip their ADT's with 100% Cat power trains and it was their #1 selling point. When the company became majorly successful Cat took notice and bought the rights to the DJB product line. All the Cat ADT machines are still produced on the same site that DJB started on back in the 70s.

It was the same story with Elphinstone and their underground equipment and Tiger with their wheel dozers designed around Cat wheel loaders. All three companies now belong 100% to Cat.

https://tractors.fandom.com/wiki/DJB

We have 2 D25d's. Good trucks, parts are available, they work good in the woods with the short wheel bases. Like John said there are a few things to keep an eye on but overall tough reliable units. If I understand correctly the power train is essentially right out of a 966d wheel loader.

Hi JPV. So what would you consider to be the main components to " keep an eye on"? and how to check? Thanks.

As far as what to look for when inspecting it that is all the normal things for any machine. The most common thing we work on are the brakes. They are air over hydraulic actuators, one on the front and one on the rear. The reservoirs need to be checked regularly, if you are loosing fluid it can go a number of places for a while before it gets noticed. The brakes themselves are supposed to adjust automatically but they don't always work so the backing plates need to be pulled off the wheel ends and adjusted manually. They will eat through brake shoes if you use them hard but the hardest part of changing them is removing and reinstalling the hub and wheel.

The 3 biggest things the operator needs to be aware of is that the parking brake needs to be fully released before driving away and to run with the dump lever in the float position pushed all the way down past the detent. If the truck moves very far with the parking brake set it will burn it out. It is a shaft brake on the back of the transmission that holds well when the truck is parked but it has enough power to drive right through it. It is about 1200 bucks to replace it and not real fun.
The reason to run in the float position is to protect the dump valve. If it is left in the hold position the shockwaves in the oil from the box bouncing around on the cylinders when running will cause the valve to leak.
The last thing is to try to keep the torque converter locked up as much as possible by running at the proper rpm. When climbing a hill that means downshifting before the transmission gets hot from the torque converter slipping. There is a light on the dash that shows when it is locked and unlocked. If that stuff is paid attention to that cuts down on problems.

Drove up west of Edmonton to take a look at the rock trucks. Someone was suppose to meet me at the auction site but know one showed up. crawled around the two units, started them up and raised the boxes; moved them back and forth a bit. One is much nicer than second. I noticed one of the back wheels brakes let loose some oil. Here are some pics.

Here are a few more pics. Notice the weld on the third pic and the leak on the back wheel track line firing I think. Maybe you know JPV.

That looks like brake fluid, hopefully it is and not gear oil because it is a lot easier to change the wheel cylinder then the wheel seal. A sniff/taste test will tell if not certain. The wheel cylinder just screws into the axle housing. It is easy to get at the ones on the rear axle, the ones on the front axle are quite a bit tougher. I built a custom socket to grab the back of the cylinder to get the front ones off. They are supposed to be locktited in to keep them from turning so it may need some heat if they don't come easy.
The welds would definitely be something to keep an eye on, we haven't had any problems with anything cracking anywhere on ours although I shouldn't say that (knock on wood)!
Based on the pictures you have posted they look good, if they were closer my boss would probably be bidding against you! They don't come up for sale very often around here, one of ours came from Texas.

JPV. I think you are right on the brake fluid. I was testing the torque converter with the brake on for a couple minutes to see if it heated up. The machines water temp started to climb so I quit the test and found the rad to be low on antifreeze. It's an estate auction sale and the equipment has been sitting for some time.