Blackmagic94
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- Oro Valley/AZ
So I have a m1078 with a bad hydro seal which I have ordered. But how can I raise the cab before I replace the seal to address a loose belt issue.
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Lifting cab
- Thread starter Blackmagic94
- Start date
scottmandu
Active member
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If you have an overhead crane or very tall cherry picker you can life the cab from the rear.. When I did it I disconnected the hydraulic lines to the lift cylinder. It made a mess.
Blackmagic94
Member
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- Oro Valley/AZ
There has to be another way. I noticed on gp a truck that couldn't be started they had the cab up
scottmandu
Active member
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Does the manual pump not work?
- 6,842
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- Stratford/Connecticut
Use a breaker bar it's to the right of the control valves.
Blackmagic94
Member
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- Oro Valley/AZ
I'm aware of the manual hydro valve. It's off the same system so no pressure there.
- 6,842
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- Stratford/Connecticut
There is a hand pump to make hyd pressure to lift the cab or move the spare tire
Blackmagic94
Member
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- Oro Valley/AZ
Yes I said I was aware of that. If the seal is bad there is no pressure via the hand pump or hydro pump motor. They are the same hydro circuit.
- 6,842
- 654
- 113
- Location
- Stratford/Connecticut
No with a bad piston seal you will still have the hand pump. If there is not enough fluid in the reservoir then the hand pump won't work. There is a small dipstick on the pump the reservoir is part of the air hyd pump.
Blackmagic94
Member
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- Oro Valley/AZ
I'll try refilling the res then.
- 6,842
- 654
- 113
- Location
- Stratford/Connecticut
A bad pump piston seal will "puff" hydro fluid out of the breather. It will look like little puffs of smoke. Sometimes the 2 hyd lines come loose. If you are standing in the bed, you can reach under the cover plate and feel them they are on the front left of the pump.
Blackmagic94
Member
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- Oro Valley/AZ
It pours out as you attempt to pump and drips down. I know it needs the seal.
- 6,842
- 654
- 113
- Location
- Stratford/Connecticut
That's more than a seal. Either the lines are loose, hole in a line or some type of warping/damage to the pump housing.
Blackmagic94
Member
- 468
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- Location
- Oro Valley/AZ
It's coming out of the breather
- 6,842
- 654
- 113
- Location
- Stratford/Connecticut
I have never heard of it pouring out there though. Fill the reservoir and try the hand pump again.
- 2,894
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- Ft. Bragg, NC
Might help if you take a picture with reference, clear up any confusion about what's coming from where.
- 518
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- Location
- Stoneville, NC
Maybe you can unbolt the latch piece from the rear of the cab and use something to raise the cab?
turnkey
New member
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- wadsworth,ill
If all else fails, disconcet the life cyld and manual life with a cherry picker...Guys over at the motor pool, have done it several times...Just make sure everything is removed ...Before the life.
That means the pump units seals are toast and it's been over filled. I saw that on one of our LMTV
deshet
Member
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- 6
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- Virginia Beach, VA
Anyone know the part number for the pump seal? I believe that I got one at Napa. Advanced, or Auto Zone in the past.
Thanks
Thanks