Straydog954

Hello all. Do they sell a gasket set for this transmission and if so does anybody know the part number? I have a part number for the O ring kit but looking to replace all the cover gaskets etc. 

Where is the “Brain Trust” when you need ‘em ?

Hello all. I’m looking at a low mileage e7-300 from a cab over to replace a tired em7-300 in a dump truck. Both are fully mechanical. Can the maxidyne pump be taken off and placed on the e7-300 to make it an em7-300 or are the internals different? Also is there an option to turn the e7-300 into a 350 or 400 hp engine and if so what would need to be done? I understand that if I get away from the maxidyne set up I would need more gears and different rears because I have T2070 and 5:73. 

On 8/25/2023 at 9:59 AM, Brandt said:

I still have this and don't want to scrap it out just yet.  I get it that transportation is the issue. If interested, let me know, sometimes a transportation issue will present a solution.

How much do you want for it?

I bought it as a complete unit pto, Hyd pump and driveshaft   I was going to put a 12 speed in my truck but my plans have changed. Not sure what ratio it is. Are you looking for the whole setup or just pto?

25 minutes ago, Vladislav said:

Steel dash is welded into the cab structure so you would need a grinder to make that swap. Probably possible if you add a few steel mounting brackets plastic dash is supported with. But on my mind (and many other's on this forum) steel dash is more exotic and rare. So seems more interesting to keep it the way it is.

Speaking the cab lengthes early (pre-73-?) cabs were shorter than later ones by 3 inches. Both DM and R. That more relates to the driver place though since DM cab has a kind of a dog house at the right to accomodate the rear portion of the engne. So a co-driver anyway has less leg room in a DM (off-set cab) than in R or RB/RD etc. 

I guess that would be a tight cab for me. I barely have enough leg room in my RD

10 minutes ago, Mackpro said:

For on road use in a CXP the 405 HP rating is best. In dump truck/logging off road use the 395 HP version is better (CTP). The turbo, EGR valve and EGR cooler are very specific to this year model engine. The EGR mass flow and temp sensor assembly is a shortened version from the ETECH ASET AC engine and prone to failure. Almost every CXP/CTP I ever plugged my laptop had active codes for this sensor. However people run them all the time like this. These engines came with copper injector cups and flat bottom injectors. There is no upgrade option to stainless cups/conical injectors for this engine like there is for the 2008 and up engines . Lots of Service bulletins on these engine for updated parts. All this sounds bad but actually they are pretty reliable. Local guy here has 8 or more of the CTP’s and they run every day. 

This one is 405hp but could be programmed to 395 I assume. In comparison to my em7-300 fully mechanical, how would this engine rate ? Mine starts pulling around 900 rpm. Is this a high torque at low rpm engine or does it need revs ?

Anybody have any thoughts on this engine good or bad regarding performance and reliability? It has no dpf 

On 6/23/2023 at 7:30 AM, Steve L said:

I would be interested in one if you still have them Bud’s

I can prob get you one but how would I get it to you?

Would the cab on this truck be shorter than an RD model? And if so how many inches?

Yes it is

That is exactly what it looks like. So this is the old style dash. Can the new style dash be swapped in by just unbolting it ?

1975 DM steel hood    Fire tanker truck

I don’t have a pic but the dash is rounded over the steering wheel and at about 45 degree angle in front of pass seat. Ignition switch is on left side of steering wheel instead of right side. Does not look like a normal Mack dash setup   

Doesn’t look like the typical vertical Mack dash it has a different angle to it 

Hi I have a question about a Mack DM fire truck. The dash area of this truck looks different than a regular DM. Can the dashboard / gauges be replaced with that of a regular DM (non fire apparatus)? Does the dash just unbolt for an easy swap? Thanks

Does anybody know what this engine is worth in running condition? Looks like is has leaks here and there, appx 325k miles unsure of hours. Prob would be buying it just to have it. Has Mack 12 speed attached to it 

Hello all. Blew a grease seal on trunnion shaft at base of trunnion due to frozen relief valve on cap. I assume this is an expensive repair. Can anyone comment on this?

Blew an O ring seal on shaft on outer side of trunnion.  Is this an expensive repair I assume. Anybody?

Hello all.  What is the proper way to grease this suspension to get the grease to where it needs to go and what type of grease is best to use?

Hello all. Currently running an EM7-300 mechanical in dump truck. Looking to upgrade to a newer truck which is an 06 with the 370.  Being a maxidyne can I expect similar performance with the stock engine or would I have to do turbo, injectors etc?

The trucks are an 88 and a 96. Both are RD 690s

Wanting to put in a good running E6 to replace worn E7 mechanical. Would this be a direct bolt in or would I need to change motor mounts etc.?

Both engines are 1996 E7 mechanical. One is 250 hp with an Allison transmission, the other is a 300 hp maxidyne with T2070. The 300 is tired. Can I swap turbo, pump and injectors from the 300 onto the 250 and turn that into a 300? Do these engines have same internals ?

Can anyone recommend a good Mack engine rebuilder in the Buffalo, NY area?