D8k,s at work

Do you have any idea how many hours they get out of a transmisson and whether they are are using third gear for part of the haul.

Mike,we pull the trans for rebuild at about 6000 hrs before failure,or as low
as 4000 hrs if the torque failes first, no 3rd gear used at all only 1st and 2nd.

[quote="roly66v"]Mike,we pull the trans for rebuild at about 6000 hrs before failure,or as low
as 4000 hrs if the torque failes first, no 3rd gear used at all only 1st and 2nd.[/quote]

Glad to hear someone still believes in avoiding catastrophic failure and a disaster in the bevel gear compartment. The rule here is 7500 or sooner. Have you seen anybody get 6000 hours out of an aftermarket Italian 1st or 2nd gear. Have you ever seen anyone replace the D342 with a 3406E or C15. Are those original Cat A/C condensers or a local conversion.

Your machines look very clean. Someone takes very good care of them.

[quote="roly66v"]Mike,we pull the trans for rebuild at about 6000 hrs before failure,or as low
as 4000 hrs if the torque failes first, no 3rd gear used at all only 1st and 2nd.[/quote]

Glad to hear someone still believes in avoiding catastrophic failure and a disaster in the bevel gear compartment. The rule here is 7500 or sooner. Have you seen anybody get 6000 hours out of an aftermarket Italian 1st or 2nd gear. Have you ever seen anyone replace the D342 with a 3406E or C15. Are those original Cat A/C condensers or a local conversion.

Your machines look very clean. Someone takes very good care of them.

[quote="Mike Walsh"]Glad to hear someone still believes in avoiding catastrophic failure and a disaster in the bevel gear compartment. The rule here is 7500 or sooner. Have you seen anybody get 6000 hours out of an aftermarket Italian 1st or 2nd gear. Have you ever seen anyone replace the D342 with a 3406E or C15. Are those original Cat A/C condensers or a local conversion.

Your machines look very clean. Someone takes very good care of them.[/quote]
yes Mike,were getting 6000hrs+ with cat shafts and bearings in the top
aftermarket mainly CGR in the rest,last rebuild we did cat quoted £17000
for parts we did it for £2800, A/C is local conversion £2000 total fitted and
cheap to maintain,have,nt seen any other replacement for the D342

c15 is an 1800-2200 rpm engine as with the "E" model. You would have to do something about the torque convertor to make it work. Installing a c15 in one would probably lug the engine to death. Were going to be auctioning off something like 80 353's in the near future. make a better replacement for the 342.👍

I would use 637s for that job!

That was my understanding until the local Cat truck engine rep informed me optimum C15 torque is in the 1200-s and it was hard to convince customers the engines needed to be operated at lower rpm-s. This started me wondering about the feasibility of using a detuned C15 to replace a D342.

Supposedly Cat reengineered a D9H at model end which utilized a 3406. I have not seen any engineering data on this so I'm still not sure if its existence is fact or fiction. I was told it used a gear reduction unit to compensate for the higher rpm. If this engineering exists, it would be a good place to start.

[quote="Mike Walsh"]That was my understanding until the local Cat truck engine rep informed me optimum C15 torque is in the 1200-s and it was hard to convince customers the engines needed to be operated at lower rpm-s. This started me wondering about the feasibility of using a detuned C15 to replace a D342.

Supposedly Cat reengineered a D9H at model end which utilized a 3406. I have not seen any engineering data on this so I'm still not sure if its existence is fact or fiction. I was told it used a gear reduction unit to compensate for the higher rpm. If this engineering exists, it would be a good place to start.[/quote]

I you pull a c15 at 1200rpm all the time the exhaust temp will go thru the roof and you "WILL" be putting a new turbo possibly a head on. We have something like 80+ 3456's, c-15's, c-16's,-c18's and the new v12 c-27's and c-32's if you want to count those too.
We have a rig with a c-15 on a mudpump and they pulled it @ about 1300 rpm to get the amount of pressure and mudflow they wanted (the proper way to obtain it is to change the pump liner size) and it pretty well burned the hot wheel off the turbo. It had a like 20 something high exhaust temp warnings and a couple of derates on it. A later maintenance on the engine we discovered that it had also cause the valves to "suck up" into the head. it only had 4500 hours on it.