Rtv 900 slow travel

Cfitz

New member
My 2010 rtv 900 will only go 10–12 mph on flat ground. Charge pressure is over 100 psi, high pressure is at about 3700 psi, brakes are not suck all tires will roll free when jacked up, servo lever is moving all the way, it takes off strong at first but the engine revs and you do not continue to gain speed, will do 30 mph on jack stands.
Does anyone have anything else I can try?
 

Cfitz

New member
1300hrs I pulled the rear of the hst unit off and the brass all seemed to be in good shape I can’t really feel anything with my finger nail
 

aurthuritis

Well-known member
Site Supporter
could you see radial lines in the plates? could you see spots that looked like tarnish? also i don't think you can see the part that seals against the pump without disassembly. i have seen a 900 that had the pin on the servopiston worn almost in half and that wouldn't allow the swash plate to be fully engaged.
 

Cfitz

New member
I don’t recall any radial lines or tarnish. I had the assist pump off and the block that seals against the main pump and drive pump. The linkage going from the servo to the servo piston has a small amount of slop in it. Could that make that big of a difference?
 

aurthuritis

Well-known member
Site Supporter
I don’t recall any radial lines or tarnish. I had the assist pump off and the block that seals against the main pump and drive pump. The linkage going from the servo to the servo piston has a small amount of slop in it. Could that make that big of a difference?

possibly. review the thread i link in the above post. it is long but has very good step by step photos. the main problem turned out to be slop in the servo piston control button and swash plate. any slop will result in less travel of the swash resulting in slow speed. not sure that is your problem but worth a look.
 

aurthuritis

Well-known member
Site Supporter
just rambling a little. most people think that messing with the servo adjustment screw will make these go faster. the only thing that screw does is center the servo piston travel. also to much pressure on the HPRV will cause the swash plate pin and button to wear prematurely from all of the extra force on the components.
 

Cfitz

New member
The swash pin and bock are very tight and have no visible wear. I will pist pictures of the plates soon.
 

Cfitz

New member
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aurthuritis

Well-known member
Site Supporter
are you going to put new plates in it while you are there? have you seen where the servo actuates the swash?
 

Cfitz

New member
Yes I took the servo piston out and checked the pin and block on it they are perfect. I will put plates in it if you think they look worn. They are defiantly not warped and I still don’t feel anything with my fingernail.


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aurthuritis

Well-known member
Site Supporter
well dog gonnit. it would be nice to be able to find an absolute failure. after all the trouble to get to where you are i think i would replace the plates,they aren't that expensive are they?
 

Cfitz

New member
I haven’t priced them yet I was really hoping to find something that looked broken.


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Lee1935

Active member
I hate to assume but you did check the simple things?
There's a recent post on this forum about collapsed hydraulic oil intake hoses ☺
 

Cfitz

New member
Wouldn’t that affect my charge pressure? Are they to two grey ones on the back?


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