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Posts posted by Mack&Cheese
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As it turns out the tachometer input is mechanical. Changed out cable with new obtained from Mack and tachometer exhibits the same fault (when running the tachometer won't go below 5-600 rpm and no higher than 1400 rpm. Very sluggish. In my troubleshooting I also found that the incandescent light bulb that is suppose to be plugged into the back of the tachometer was not plugged in, so I suspect that the insides of the tachometer are full of dust and contributing to the sluggish operation, and apparent sticking of movement. Anyone know how to take these apart??
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Thanks everyone for the information.
Oil and filter change is Monday (Memorial Day) and transmission & differentials are Thursday. I will post my results.
My E7 has two (2) spin-on oil filters, and a centrifugal filter.
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Thanks Jim, I will start there first. Appreciate the feedback!
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New to BigMackTrucks, and just purchased a '91 RD688S Dump Truck, E7 460HP, Maxitorque 18 speed, all Mack.
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On my '91 Mack RD688S the tachometer doesn't move much at all and usually stays in the 1400 RPM range regardless of engine speed.
Where should I look first?
Thanks!
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New Mack owner here, and needing some information on my truck's capacities.
Its a '91 RD688S (Dump Truck), E7 460HP, Maxitorque 18-speed, Mack differentials. I am in need of the amount and types of lubricants used on these components.
Where can I find a spec sheet on the engine and transmission that shows these capacities?
Thanks in advance for the help!
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Hard starting after parked for a few days.
in Engine and Transmission
Posted
What is the routing of this plastic line. Which side of engine, to where? I may have a similar problem that I'm chasing.