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post #1 of 22 Old 05-17-2017, 11:29 AM Thread Starter
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3k series Hydraulic/Drive problems

Hey All,
I've got a 2007 GT 3200 with front hyd lift and hyd deck lift , it's got less than 300 hrs on it , always been well maintained , and 2 yrs ago I changed hydro fluid and filter , oil is still like new .
All I really use it for is mowing and snow blowing . 2 days ago I was mowing , was fine for 5 hrs , then we started mowing ditches , not overly steep , but grass was thick , was working fairly hard , all was fine till I tried to push out another mower that got stuck , cub just bogged down and stalled , once we got unstuck , I continued mowing without a problem for probably 30 mins . Then I started losing my power steering and deck lift , I was now getting a whining noise when I tried to use hydraulics , then I also started to lose drive , sometimes it would do nothing at all , other times it would move but make horrible noise , I found if I turned motor off and restarted I could move again , this is kind of intermittent , in that sometimes I get nothing , and sometimes I get movement , and some hyd acc movement aswell. I know from other people's experience these machines suffered from exploding charge pump gerators , so yesterday I removed mine ..it's fine , no sign of wear or damage . Oil level is good . The pump does not appear to be making any noise itself , seems noise is actually coming from lines , im wondering whether I damaged one of the check/relief valves when I was working it hard ?. I've ordered a new filter, gonna try that first as that's just about the cheapest thing to start .
Any thoughts on this ?, I'm thinking if the pump is shot , it wouldn't work period.
Tnx Matt
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post #2 of 22 Old 05-17-2017, 12:47 PM Thread Starter
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Re: 3k series Hydraulic/Drive problems

If it's one of the relief/check valves , which one is it likely to be ?Click image for larger version

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Thnx
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post #3 of 22 Old 05-17-2017, 12:49 PM
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Re: 3k series Hydraulic/Drive problems

Matt, I don't see how the pump could be shot at 300 hours. I wonder if the pump picked up some trash running it on the side of a bank and you stopped up the filter. Please let us know how it works when you change it. Good luck.
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post #4 of 22 Old 05-17-2017, 03:25 PM Thread Starter
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Re: 3k series Hydraulic/Drive problems

That's my thinking , especially as if I switch it off and restart it, I get some pressure back , just that the oil is still as clean as the day I changed it . Dealer hadn't got a filter, and I only fit cub filters on it , so I won't get it till next week . Another thing I thought of with the incline , it may have taken a gulp of air , and just needs priming .
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post #5 of 22 Old 05-17-2017, 03:26 PM
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Re: 3k series Hydraulic/Drive problems

The filter change is a good first step, but check the old one for shiny bits and pieces before installing the new one. I blew the differential carrier bolts in my GT that resulted in similar symptoms to what you describe as the bolt heads chewed up the inside of the housing and eventually plugged the filter.

When relief valves fail, nothing works. You didn't hurt the relief valves if you drove the tractor afterwards.

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post #6 of 22 Old 05-17-2017, 04:51 PM Thread Starter
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Re: 3k series Hydraulic/Drive problems

Does the oil flow straight from pump to filter then to rest of system ?, reason I ask is the pump and filter couldn't be much further away from each other :/
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post #7 of 22 Old 05-17-2017, 09:45 PM
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Re: 3k series Hydraulic/Drive problems

I'm thinking you're looking in the right place...I'm betting a filter change will do it!

Bizarre your dealer doesn't carry a filter though...and a week to get one?
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post #8 of 22 Old 05-17-2017, 11:00 PM Thread Starter
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3k series Hydraulic/Drive problems

They only just started doing cubs in my local city .. I used to use dealer in city 2 1/2 hrs away , parts have to come from warehouse 2000 miles away :/. Order by Thursday , get following Thursday ...ish :/
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post #9 of 22 Old 05-17-2017, 11:50 PM
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Re: 3k series Hydraulic/Drive problems

Quote:
Originally Posted by Doolie View Post
Does the oil flow straight from pump to filter then to rest of system ?, reason I ask is the pump and filter couldn't be much further away from each other :/
Fluid flow path is:

- Reservoir (rear end) > Filter > Charge pump > Hydro pump and implement lift hydraulics > Reservoir.

The hydro pump gets priority. The implement lift hydraulics gets whatever is left over.

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post #10 of 22 Old 05-18-2017, 01:21 AM Thread Starter
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Re: 3k series Hydraulic/Drive problems

So am I right in assuming that the filter is under suction rather than pressure ?. If so I can now see why that it wouldn't take much to restrict oil flow .
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post #11 of 22 Old 05-18-2017, 01:29 AM
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Re: 3k series Hydraulic/Drive problems

Yup! It's under suction, but there are a lot of square inches of filter medium to plug up, and the flow rate is only about 3-4 gpm.

It's rare for those filters to plug. If one does, you really need to open the rear end to find out why. Something is getting chewed up.

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post #12 of 22 Old 05-18-2017, 08:21 AM
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Re: 3k series Hydraulic/Drive problems

When you looked at the charge pump was the drive pin intact? Sometimes the ends shear off (actually just crack from fatigue). Sometimes they break so cleanly, it doesn't look broken. Item 1 below.
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post #13 of 22 Old 05-18-2017, 09:38 AM
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Re: 3k series Hydraulic/Drive problems

I only use Wix 51410 hydro filters. Your local auto parts store should carry them. I'm not trying to start a filter debate just trying to get you back up and running.
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post #14 of 22 Old 05-18-2017, 11:24 AM Thread Starter
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Re: 3k series Hydraulic/Drive problems

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Originally Posted by TUDOR View Post
Yup! It's under suction, but there are a lot of square inches of filter medium to plug up, and the flow rate is only about 3-4 gpm.



It's rare for those filters to plug. If one does, you really need to open the rear end to find out why. Something is getting chewed up.

I don't like the sound of that
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post #15 of 22 Old 05-18-2017, 11:32 AM Thread Starter
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Re: 3k series Hydraulic/Drive problems

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Originally Posted by Hydronerd View Post
When you looked at the charge pump was the drive pin intact? Sometimes the ends shear off (actually just crack from fatigue). Sometimes they break so cleanly, it doesn't look broken. Item 1 below.

Mine is different to that, if I remember correctly the shaft was splined , and the gear was tight on it . I didn't check for a pin , but I can't see one in parts diagram either .Click image for larger version

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