My boss’s Pettibone 80scp crane has problem

[c0rn_d0g$]

So, my boss just snagged a Pettibone 80SCP crane to get the work done faster, and he told me to move it in two weeks max.

I finally got the engine running and even got all the other functions working, boom, hoist, all that good stuff.

But here's the killer, I can't get it to drive! Like, that's the most important part since I gotta load this beast onto a lowboy.

I figured out how to get the other functions working by manually tying off the pneumatic solenoids on the sides of the gearbox.

This transfer case thing has four of 'em (two on the side, and one by each output).

Does anyone out there know what magic combination of those solenoids will actually engage the drive? I'm totally stumped, any help would be a lifesaver!

 

[NelsOnn]

Typically, you need both side solenoids energized to shift into drive and one of the output solenoids to direct power, try energizing both side solenoids first, then test each output one by one, you should hear or feel the shift when it grabs, if not then, you might have a bad valve or no pressure

 

[Victordoom]

So, my boss just snagged a Pettibone 80SCP crane to get the work done faster, and he told me to move it in two weeks max.

I finally got the engine running and even got all the other functions working, boom, hoist, all that good stuff.

But here's the killer, I can't get it to drive! Like, that's the most important part since I gotta load this beast onto a lowboy.

I figured out how to get the other functions working by manually tying off the pneumatic solenoids on the sides of the gearbox.

This transfer case thing has four of 'em (two on the side, and one by each output).

Does anyone out there know what magic combination of those solenoids will actually engage the drive? I'm totally stumped, any help would be a lifesaver!

What sequence did you try with the solenoids so far?