Pallet stacker hydraulic problem

[6ply]

Making sure the final dregs are out. I'll squirt a bit of oil back in and then see if I can find some suitable seals.

 

[fizzy]

Either something broken/blocked in the pump/valve body or the piston is stuck in the bore. I've seen it before on single acting cylinders, corrosion builds up on the cylinder wall and the piston gets forced over the corrosion by the hydraulic pressure but there's not enough pressure to force it back over it in the opposite direction. Only way to know for sure is to pull the rod out and inspect the piston and cylinder.

It happened after it was laid down on its back to be moved in a van. That was 14 years ago. Never worked since. I have a forklift but would be handy.

 

[voipio]

Hard to tell from the image of the inside of the cylinder, but there look to be signs of corrosion. Honing the cylinder might be an option, if the corrosion isn't too bad. A decent hydraulic specialist should have a honing machine.
Probably the wrong end of the country for you:

Cylinder Service Centre - Specialist Hydraulic Cylinder Services

Leading the market in Specialist Hydraulic Cylinder Services. We are based on a two-acre site in the heart of North East England.

www.cylinderservice.co.uk

These people are in Dorset:

Hydraulic Cylinder Manufacturer | Ram Reman Hydraulics

Ram Reman hydraulics specialise in the design, manufacture & repair of hydraulic cylinders and supply a vast range of hydraulic and pneumatic equipment.

www.ramreman.co.uk

Hydraulic Repairs Dorset | Hydraulic Hoses, Pumps & Cylinders

Fast Hydraulic Repairs in Dorset: Hoses, Pumps, Cylinders. Fix downtime! Quay Mfg. repairs and maintains all hydraulic systems for reliable performance.

hydraulicrepairsdorset.co.uk

 

[6ply]

Hard to tell from the image of the inside of the cylinder, but there look to be signs of corrosion. Honing the cylinder might be an option, if the corrosion isn't too bad. A decent hydraulic specialist should have a honing machine.
Probably the wrong end of the country for you:

Cylinder Service Centre - Specialist Hydraulic Cylinder Services

Leading the market in Specialist Hydraulic Cylinder Services. We are based on a two-acre site in the heart of North East England.

www.cylinderservice.co.uk

These people are in Dorset:

Hydraulic Cylinder Manufacturer | Ram Reman Hydraulics

Ram Reman hydraulics specialise in the design, manufacture & repair of hydraulic cylinders and supply a vast range of hydraulic and pneumatic equipment.

www.ramreman.co.uk

Hydraulic Repairs Dorset | Hydraulic Hoses, Pumps & Cylinders

Fast Hydraulic Repairs in Dorset: Hoses, Pumps, Cylinders. Fix downtime! Quay Mfg. repairs and maintains all hydraulic systems for reliable performance.

hydraulicrepairsdorset.co.uk

Yes, there is some minor corrosion but I'm hoping it is insignificant. I'll try changing the seals and see if that works.

 

[Turbo]

Probably a good idea to check the condition of the bearing and wiper seat in the end cap.

Also make sure there is no chance of that badly welded collar scratching the bore of the ram.

 

[frank horton]

just to say
the cylinder had a weepy leak on my 25ton Tangye jack used for a press....
nightmare getting a seal kit....
Used a little Wyyns engine oil seal reconditioner fluid.....
No more leaks in 15 years....

 

[6ply]

just to say
the cylinder had a weepy leak on my 25ton Tangye jack used for a press....
nightmare getting a seal kit....
Used a little Wyyns engine oil seal reconditioner fluid.....
No more leaks in 15 years....

I did wonder about topping up with a heavier oil.

 

[6ply]

Now I've cleaned the seal off I can see it has a split that goes right through. Excellent! That improves my chances if the seal is replaced.

 

[6ply]

Who knows their seal designators? Looking online, this seal appears to be prefix type US, with an inner and outer lip of the same length. Is that correct? Any idea of the material?

 

[6ply]

I contacted a local supplier and should be getting a price next week. It's a standard imperial size. 1 x 1.5/8 x 3/8