CK25 HST push power problems…

[BigDogues]

BIG: does the tractor pull OK in reverse? If it is OK, then I would look into the FORWARD RV.

Your tractor uses 2 hi-pressure relief valves (4000psi), easily accessible. The FORWARD RV may have dirt in it, or a cracked spring. Easy enough to pull it and look.

If both forward and reverse are weak (low range), then you have a bigger systemic problem with the HST. I hope the fluid is clean, and the suction screen not gunked up.

You would not by chance know where both these RVs are located on my machine?

 

[dfkrug]

You should look at the thread I posted on TBN in 2010, dealing with the CK HST relief valves:

How to increase HST relief pressure on a CK30

This thread has resurrected an issue I have with my Kioti's HST and HSTs in general: http://www.tractorbynet.com/forums/bobcat-tractors/165728-attacking-power-problem-ct225.html This issue was talked about in other threads over the years, including this one...

www.tractorbynet.com

As for the HST charge pump, which is shared with the power steering pump, you can sometimes get an indication that that is the problem when the PS gets weak.

A proper approach to your problem is to get a service manual, a 10,000psi gauge, and test your pressures (HST fwd and rev, and charge).