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'95 Mack RD686 dump truck build

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'95 Mack RD686 dump truck build

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Old 03-10-2012, 05:37 PM
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'95 Mack RD686 dump truck build

hey guys,
ive been meaning to start this thread for a while now.
i'm a mechanic for a small dump truck company, 14 trucks, all Macks, when this '95 is on the road it'll make 15. got the truck in the fall, been in the shop since January. E7 350 Mechanical, 13 speed, 4.42 rears. 188k miles. truck is in **** good shape for being a '95.
dont have a whole lot of time here to be thorough with this post. ill def be adding to it. heres a list of what we've done so far:
new trunion bushings
new elephant pads
new rear engine mounts
hub pilot conversion
gutted interior including windshield glass
repaired dent in back of cab
added switches to dash
run wires from dash to back of truck

stuff that still has to be done
build hyd system (4 spool)
mount dump body
finish front plow bumper
reassemble interior w/newer panels
flush out rears/fill with 75/90 syn
prep and paint frame

gotta cut this short here...problems uploading pictures. ill try again later
any Mack experts out there, i got some q's regarding one of our other trucks.

thanks for reading,
Drew
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Old 03-10-2012, 09:33 PM
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Originally Posted by drew1021 View Post
hey guys,
ive been meaning to start this thread for a while now.
i'm a mechanic for a small dump truck company, 14 trucks, all Macks, when this '95 is on the road it'll make 15. got the truck in the fall, been in the shop since January. E7 350 Mechanical, 13 speed, 4.42 rears. 188k miles. truck is in **** good shape for being a '95.
dont have a whole lot of time here to be thorough with this post. ill def be adding to it. heres a list of what we've done so far:
new trunion bushings
new elephant pads
new rear engine mounts
hub pilot conversion
gutted interior including windshield glass
repaired dent in back of cab
added switches to dash
run wires from dash to back of truck

stuff that still has to be done
build hyd system (4 spool)
mount dump body
finish front plow bumper
reassemble interior w/newer panels
flush out rears/fill with 75/90 syn
prep and paint frame

gotta cut this short here...problems uploading pictures. ill try again later
any Mack experts out there, i got some q's regarding one of our other trucks.

thanks for reading,
Drew
Welcome to DTR Drew!

Don't swear or try to. The software will delete out bad words and leave '****' in their place. Don't substitute symbols for letters to MAKE a swear. An admin will delete it instead of the software and get angry in the process! Angry admins are never a good thing.

Hvytrkmech is pretty much an expert in all things 'truck'. So are a few others.

Cincy is an expert with sheep.

Bark is an expert with shrews.

I am not an expert in anything. Any info you get from me is to be taken with a grain of salt. And is worth just about the same.
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Old 03-11-2012, 02:22 PM
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thanks for the heads up.
when i get back home tonite ill try those pics again....does that software automatically resize the photos or do i have to do it manually before i try and upload them?

are the mack E7 unit pumps serviceable? 4 out of 6 pumps on one of our trucks are leaking, seem to be coming from the cover of the pump, held on with 4 screws. wonder if theres a gasket kit available from mack?
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Old 03-11-2012, 02:29 PM
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I would recommend using a photo hosting site such as photobucket, you'll get the best picture quality here with that.

Welcome to the site, we're here for you.

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Old 03-12-2012, 01:44 AM
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Welcome Drew. I'm no expert but I wouldn't be surprised if the leaking pumps was due to ULSD "drying out" the pumps. I seem to recall issues related to that with the VE pump on the 1st Gen Cummins. Don't know anything about Mack injection pumps but are they made by Mack or are they 3rd party? If they are 3rd party, check with them about pump gaskets.
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Old 03-12-2012, 12:35 PM
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IIRC the Mack engines use the Bosch pumps don't they? That cover with the 4 screws should be just an adjustement cover with a thin cork gasket. Should be able to get that anywhere. They start to leak with time.
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Old 03-13-2012, 05:44 PM
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the older mechanical macks used the bosch p7100, some of the newer ones used the p8500 pumps with some electronics.

the truck in question has an E7 with unit pumps, which means that each cylinder has its own pump.

ill call the mack dealer tomorrow and see what they say about the cork gaskets.

stay tuned for pics of this truck build.

thanks,
Drew
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Old 03-15-2012, 01:01 AM
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Originally Posted by drew1021 View Post
the older mechanical macks used the bosch p7100, some of the newer ones used the p8500 pumps with some electronics.

the truck in question has an E7 with unit pumps, which means that each cylinder has its own pump.

ill call the mack dealer tomorrow and see what they say about the cork gaskets.

stay tuned for pics of this truck build.

thanks,
Drew
I have a friend who makes gaskets out of anything he has laying around. He has good results with cereal boxes and old license plates. Of course, Nebraska's are a flat piece of aluminum.
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Old 03-16-2012, 06:26 PM
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The unit pumps are nonserviceable, make sure you get new bolts that hold them in, don't reuse the old ones they tend to break. Your old pumps are cores new pumps about 450$ each give or take.
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Old 04-03-2012, 06:19 PM
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quick up date:
installed dump body yesterday, got the hinges all welded in today, got a few minor things to do tomorrow(flap brackets, mount the mounting tabs for the tailgate spreader) before it goes to the sandblaster in the next few days then off to paint.

ill get these pictures up soon somehow or where.

thanks.
drew
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Old 04-09-2012, 06:33 PM
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Looking forward to some pics Drew....
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Old 04-27-2012, 11:34 PM
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pics?? i'm interested
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Old 02-04-2013, 08:58 PM
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Like to see those pictures, drove lots of those older r models, started on an old 250 hp , then a kick butt 315, a 1990 e7 400, a 96 electronic e7 400, then i just got tired of trying to keep up to everyone, so i got a cl733 with an isx 565 , so its more or less the big dog around here still
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