Dieselfixer

Found out it was a air pressure problem. The PTO control was not sending enough air pressure to the pto to fully engage and hold it in.

This PTO is mounted to the back of the trans on our 1986 RD690 with the twin sticks trans. Trying to identify the pto. It won't stay engaged when trying to raise the dump body. Any idea of the info and availability of it? Thanks!

Hey All Thanks for the replies. It was a bad injector causing the problem.

Got it Pro. Thanks. I'll try to do it this afternoon.

Thanks Mackpro. My e mail is al@bensonconstruction.com It just sterted doing this. No one has been into the engine.

Haven't had a chance to work on it yet. I will update soon.

Hi all Have a 2019 with a MP7 that is getting a lot of fuel in the motor oil. The fuel is about 6 inches above the full mark on the dipstick. Oil was changed recently. Any suggestions as to the entry point? Thanks

Thanks All I will look into the linkage first.

The problem I'm having with it is when trying to dump a load the pto is popping out of gear. If the truck is empty the body will go all the way up with no problem. I'll have to take it apart and see what's going on with it.

Hi All I have a 1986 DM685S with a Maxitorque extended range transmission. I'm trying to identify the pto that is on it. It mounts to the back of the trans. If anyone can help identify it or maybe has 1 for sale please let me know. Thanks, Al

Hey All I am looking for a front spring hanger and cross member for a 2001 RD688S. The part number on the spring hanger is 53QK5120B. This is the hanger at the right side front, of the steer axle spring and the cross member that the engine and radiator mounts to. So far I've had no luck and Mack says its on backorder & no idea of when it will be available. This has been since the 15th of January. If anyone knows of a used part please let me know. Thanks!

I have a few old Macks to sell, 1988 DM685S dump, 1986 DM685S dump, 1966 Tractor, 1980 R tractor 1986 R Tractor, 2001 RD688S quad dump(have 2 of the 2001's. Would like to sell instead of scrapping. All of them are in Lumberton,NC

Hey All I am trying to find the location of the switch that would turn the engine fan on when the A/C is on. The A/C cools pretty good as long as the truck is moving but not while stopped. I thing the engine fan should come on with the A/C? The fan comes on and off while driving. It's a E7 427 engine in the truck. Thanks!

Took it for a ride and it cleared up and is running as it should. Thanks all for the replies.

I did replace all $700.00 worth of lines. I think I'm going to take it for a ride and see if it clears up. #