Some info on Cat 7155 Trans

[R Racing]

I just finished a repair on a M917 that required a trans swap . I had a rebuilt 1 from a GL auction and swapped it out. Well the rebuilt 1 was sitting in a crate for a # of years and things do get sticky.So after starting the truck and air was up I pushed the air button and all you could hear was air pushing out of the vents in the head. The air pressure dropped from 120 to 90 in about 3 seconds. It was not a good start to a day .I tried the oil in the air line and even after 3 bottles still the same. So I called Cat ( Sugested by Bruce AKA BKubu ) and to my suprise they not only heard of the 16 speed 7155 they new it well and even had a truck with a portable test rig for it !! After several lengthy conversations with them I found out that the cat 7155 was used on I believe he said 4 other model earth movers . He said that they had in just 1 location 3 guys that specialize on the trans, And that parts were still available ! I quized him on it a bit and he himself had worked on the trans and knew it well. So while waiting from a call back from a closer service location, I pulled the umbilical cord off of the ****er ( it coms off with 3 bolts ) and poured air tool oil down the 13 ports and then hooked it back up to the shifter and let it build air ( a quick way to build air in a shop setting was use the air compressor thru a regulator to the red glad hand in the front . after shifting for a bit the big air leaked stopped !! then I had 2 small 1s from the 4th and 7th vent. after repeating adding oil to the umbilical cord 3 or 4 more times the trans was shifting like new and I was driving it around with no air leaks . I did later discover that I still have a problem when the trans is put in neutral, it doesnt want to go back into gear and leaks a bit of air.But another oil in the cord got it going again . So I now have a Cat manual on its way and I made a appointment for cat to take a look at it. So in a way its good news to know that not only the military use this trans but other Cat equipment did as well , And there are still people out there that can fix them

 

[NSCoyote]

glad to hear both bout the availability of parts and you got things going. whats the price tag on the tech manual for the 7155 by chance?

 

[NDT]

Thanks for the info! Please let us know which cat house has the techs and the parts. Most dealers including Mustang Cat here in Houston do not know this trans.

 

[BKubu]

The CAT dealer in Elkridge, MD and, I believe, Upper Marlboro, MD know this transmission. The former I know to be fact and the latter I believe is what Jim told me this evening on the phone. I am sure Jim will confirm this.

 

[R Racing]

Yes at both Elkridge and Upper Marlboro ,Md they work on them. The Manual was $36.00 and the shop superviser said it was a must have and well worth the money .

 

[powerhouseduece]

Do they have the manual in PDF form? Glad to hear you got it going. I too have done the air tool oil down the shifter cable, it works like a charm. For me, it even sped up the delay between shifts, just a little bit.

 

[TacticalTruck]

Is that Alban Tractor up there or some other Cat franchise?

Jeff

 

[R Racing]

Its Alban Jeff.

 

[Andy1234]

Jim,

Is there a part number or some other reference number that we can use when calling a local Cat dealer to order the manual?

Thanks,
Andy

 

[R Racing]

There is Andy, Let me go see were I stashed it in my truck. LOL

 

[R Racing]

OK Cats PN for there manual is SENR7002

 

[Andy1234]

Thanks!

 

[wreckerman893]

I loved the Cat trannys in the Army (drove them in 915's/916's) but have been gunshy of them out here since Cat shop time will eat your lunch.

All the fun of shifting gears without the clutch (I got a knee headed for replacement).

I may have to get a M915 with one in it now.