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3388 hydraulic issues

E

Eric in IL

Well-known Member
I am trying to help a neighbor with his 3388. He has a different planter this year which has a Rawson hydraulic planter drive.

We have a flow rater box and have set the flow on the hyd. motor drive remote at 4 gal./minute. This is what the Rawson unit requires. The Rawson is happy, works fine.

The problem is the planter will not lift with the Rawson running. The tractor pump is making 17 gallons of flow. So we SHOULD have 13 gallons left to raise the planter, but somehow don't.

Just wondering if anyone had similar issues and had found a cure.

Thanks, Eric
 
You said you set the flow on the planter. Don't know if you really meant that to come out that way or not. But , you never set the flow at the control at planter with this pfc system. You have to set flow on the tractor flow control lever and use the priority valve,(number one valve, black handle). If you restrict the flow at the planter the pump will attempt to force all flow through , destroke pump and leave nothing for other valves. Always treat a pfc closed center system which you have like it was open center with no restrictor at the planter or any hydraulic motor or cyl. If you had the old John Deere style closed center, then you can orfice off at any place you want and still leave flow for balance of system. I am assuming the tractor has original hydraulic system and not been converted to gear pump which some have been.
 
To set the flow we plugged the flow rater box into the remote outlets for the lever nearest the operator seat. Then set the lever to "run" position and adjusted the flow to 4 gallons with the plastic lever near the cab floor.

The tractor has the original hydraulic system.
 
Darn, thought it might be that simple. You have it hooked exactly right from your description. I think what you have going is a leaky, missing or broken signal check valve between the first valve and the other valves. To test for this, you can remove the signal line from number one valve, start engine low idle, activate one of other valves and if oil comes shooting out it is signal valve problem. Also, before unhooking anything, see if the other valves work with motor valve in neutral, and again if they will latch when motor valve is running your planter. A valve receiving no oil will stay latched but one trying to work will kick back off.
 
I tried this on a 7250 that was having to stop to lift the planter, it's running vacuum and fertilizer pumps off the 1st and 2nd remotes. Opened up the restrictor valve in the hydraulic line and adjusted it in the cab, and the planter pops right out of the ground now.
 
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