Anyone dealt with transmission trouble on a CAT 130G?

[Mr. McTuggart]

When I raise to high idle, pressure returns to normal. Cold pressure checks are just within spec. Other gears stay at minimum spec.

Could this be piston seal/internal leakage, or something else? Anyone seen this before? Thanks

 

[James R.]

Sounds like you're losing pressure at low RPM. It could be internal leakage, worn piston seals, or even pump wear. I'd also check the pressure relief valve and suction side for restrictions.