03 XT-2800

[Yuke]

Hello all I recently purchased this XT-2800 and the right side is weak and whines only under load the more under load the worse it is on level it goes equally well with the left at full rotation and speed. P.o. told me he was 95% sure it was the wheel motor. Upon inspection found it to have a White-80380 (13976) motor which a Dixie tech said is no longer available only to be replaced with Parker and 2 would have to be replaced. I switched the wheel motors and the trouble still stayed on right telling me the problem is in pump or filter maybe. I am confused because right pump looks to be new or rebuilt already. My book says I have a Sunstrand 10 A pump # 65070 ? I have not taken the pump off yet to verify what make it is as I thought it's a Hydrogear pump but could be wrong. I did hear that a dump valve can sometimes stick closed or partially closed causing I'll effects. I know I should try replacing the filters and oil but they both look like they have been recently changed ? Any suggestions before I drain the oil and take pump off and tear open.

 

[hlw49]

If the pump is making a loud whinning noise it is usually the pump. You can have it checked with a flow meter and pressure gauge. Wheel motors usually feel like it is quivvering, Kind of like a chattering.

 

[hlw49]

I would never change out any of the hydro parts without changing the fluid and filters. I change the parts filters and fluids and flush the sytem to make sure I get all the metal shaving out of the system.

 

[hlw49]

Problem is there is not enough demand for them to make it profitable for more manufactures in the industry.

 

[Auto Doc's]

I usually find the pump wear plate face worn or weak plunger springs in the pump pistons. There are times when the hard lines can get debris trapped in them and it chokes the fluid flow if the machine has had neglected servicing. I have actually had to use string fed gun bore brushes to clean out the hard lines in the hydraulics for a couple of units.

When they make noise that is a sign of fluid starvation or fluid cavitation due to aeration in the pump.

 

[hlw49]

anyone ever try plaining down the end cap and cylinder

 

[Auto Doc's]

If you mean the brass faced plate that the plungers ride on, yes, I have used 600 grit wet/dry sandpaper with oil on a flat tempered glass tabletop. Most can be saved that way if they are not gouged badly from metal debris.

 

[hlw49]

Some of them don't have the brass faced wear plate