Compair Holman 5 ton dumper' Shuttle box. Excess pressure blowing spin on filter apart

[Slowmotion]

Appears to be a Spicer COM-T4-2012 transmission.
Can anyone suggest probable cause and remedy?

 

[Left hooker]

Gearbox Breather blocked
Or relief valve stuck shut

 

[Slowmotion]

Gearbox Breather blocked
Or relief valve stuck shut

Thanks old chap. Would the relief valve be internal/external?

 

[Left hooker]

Thanks old chap. Would the relief valve be internal/external?

Wouldn't know but from your symptoms I'd say either or both might be give you the issue

 

[Mick-the-fitter]

Does it drive at all? What is oil level like?

 

[Slowmotion]

Thanks old chap. Would the relief valve be internal/external?

Does it drive at all? What is oil level like?

No drive, Have changed the oil twice and each time I engage the shuttle most of the oil has been blown out destroying the filter.
Hydraulic systems are fine.

 

[V8Druid]

return line/gallery blocked ... filter is getting full pressure with no where for it to go

 

[Slowmotion]

return line/gallery blocked ... filter is getting full pressure with no where for it to go

Thanks mucker. Have been reading on Spicers site and they say high pressure on any of the test ports indicates a failure in the control valve.
I'll have to have that apart.

 

[Mick-the-fitter]

Yep could be either, blockage, or the shuttle valve assy.