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There are not many resistors on the truck, most are resistive heating elements. It sounds like this is the termination resistor on the data bus. Sheet 7 on the schematic…

Yea they usually wont move at all when the safety is hung up. It isnt still chained down is it:) If it moves, that sounds more like a clog at the control valve orifice. If you loosen the fitting facing to the rear of the truck on the cylinder, and you can move it further than 1/2" and fluid...

There is a safety check ball in the cylinder base. It is held off of its valve seat by a spring. The fluid flows around the ball and past the spring. If the flow gets to fast it compresses the spring and the ball seals and locks the cylinder. This check works with the restricted orifice in...

I guess if your latch leak is bad enough, that could also allow the outflow from the cylinder to be great enough to trip the safety in the cylinder base.. If it locks again when you try to lower it, you may need to disconnect and cap the line to the cab latch...

Or you have gotten air in the cylinder. Because of the angle that cylinder sets at it is succeptible to the inconsistent flow caused by air pockets in the oil. This can cause the cylinder to lock in the up position as the load/safety check gets pushed against its seat and held there by the...

Yea the engine is probably OK with that much HP if you can keep it cool:)… I think I would be more concerned with the transmission. The highest 3000 series spec I have seen is in the lower 300s…

If you are using the lower pump, you need to add the fluid to the lower pump. There is an allen head screw plug on the rear outboard corner. The control valve system is plumbed so that it sends returning fluid with a preference to the lower hand pump, so it always remains full/topped off. In...

if it is only 3/4 up, As soon as you shifted the cab control to lower the cab should have come down via gravity... 1. Where was it leaking? 2. Where did you add fluid?

Yes they can be rebuilt, but you need to be absolutely certain the mechanical park springs are caged properly when you break them down or else they will kill you when the locking collar is removed…

Yep, you can use 5 pins everywhere, that way you only need two types(12 and 24v coils). A 4 pin where a 5pin should be will indeed cause some issues:)

Geo that porus breather is the air outlet muffler from the air piston exhaust. When the piston seals start leaking it starts to let oil from the hydraulic side to the air side and that is when you start to get oil mist spray It is a dead end for water going in as any tgat does will beblown...

Anything connected to TB2 in any of these drawings is hard connected(not switched) to ground. If pin 86 has voltage, then this relay will energize, passing power from pin 30 to pin 87. 86 is an input. If it has voltage on it, it is coming in on one of those 4 lines connected to junction E3...

Yep open diffs…

Well sort of:) Anyplace you see TB2, thats ground. Pin 85 on these relays is always connected to ground. Pin 86 will always have the + voltage applied. When voltage and ground are pplied, the coil pulls in and connects pin 30 to 87. When you de-energize the coil it shifts the connection so...

Or something further up the circuit is telling K30 to energize… the lighting circuit is a real fun one, enjoy:)

Depends on exactly where the air is coming from… Where exactly is the air coming from? All the brake venting should be plumbed outside the cab. The treadle valve vent and the park valve vent are tied together and exit thru a port in the floor right in front of the radiator. If the treadle...

They did that on the Steyr trucks. I think the general concensus is that it sucks...

Interesting cab suspension…

That would be correct. You close the control then open the supply or deflate solenoids appropriately to control tire pressure. That was my prototype. I put up a slide show of that original wiring(drawing and pics) In another youtube video On my channel. I do it a little differently with a...

Those only really work if the space is sealed really well... a space heater is far more effective.