M1078 Cab tilt hydraulic

[FrankTEXSAR]

Hi all,

I am having a problem with the cab/tire tilt hydraulic on a M1078.

When I activate the pump, hand pump or electric, the hydraulic fluid comes out at the cab locking pin.
The cab does not move at all.

Any suggestions on how to trouble shoot this the best way?

Thanks,

 

[NDT]

Get a 1-3/4 wrench and remove the latch cylinder cap. Pull out the plunger and replace the National #216 O-ring inside.
There is a thread on how to do this.

thread:

Critical FMTV PM not covered in TMs

I was in the process of raising the cab of the M1078, when just starting on the way up, the cab latch cylinder blew out, spraying hydraulic fluid all over the right side of the truck. The oil came from the indicator plunger, which we are supposed to look at to make sure the cab is latched down...

www.steelsoldiers.com

 

[Ronmar]

you have a blown seal(oring) in the cab latch. You can disassemble it and replace the seal, but that latch needs to be sealed in order to send pressure on to the lift cylinder. You can remove and cap the line and manually pull out the pin from the end to tilt the cab, but you should be able to reach the latch for repair OK if you lower the spare tire. you will need a big wrench or socket to unscrew the end to get at the piston/seal...