Backhoe NH TC33DA FEL control valve

mikeevans · Oct 23, 2012

I have a NH TC33DA that when I move control valve forward into float position it immediately pops out. Doesn't matter if the bucket is on the ground or in the air. It also has a speed dump option if you push handle all the way to the right which doesn't go any faster than regular dump position. Is there adjustments on the valve or does it need to be resealed? Are there reseal kits for these or should I just change valve?

jinman · Oct 23, 2012

Hi Mike, and welcome to TBN and the New Holland forums. I'll try to answer your questions.

1. The float position is held in place by a spring loaded indent feature in the joystick valve spool for the lowering (full down) position of your FEL. Sometimes the indent gets worn or the spring gets weak that holds the indent ball and the joystick will not stay in the indent position. You either have to hold the joystick in that position or get the indent spring and ball cleaned or maybe replaced. If you are lucky, with repeated use, the indent will free up and start holding. Even when they work perfectly, it doesn't take much to pop the joystick out of indent.

2. Your "speed dump" position for dumping the bucket only provides increased speed when the bucket is full. The weight in the bucket is actually used to assist the hydraulic fluid flowing from the curl side of the hydraulic ram to the back side. All your joystick does is to connect both sides of the hydraulic cylinders together so fluid doesn't have to go back to the reservoir and be pumped back through the joystick. It can just flow out one side of the cylinder, to the joystick, and back to the back side of the cylinder. Of course, the normal fluid is being pumped through the joystick valve at the same time, so this provides just a bit faster operation. It's not something you'd even really be able to measure without a stopwatch to time the bucket dump cycle difference.

I hope this helps you understand a little better what is going on with your tractor. I don't think you have really any severe problem, but the indent could be looked at and probably repaired without much expense if it doesn't start working after repeated use.

mikeevans · Oct 23, 2012

Do they make a repair kit with a new ball and spring and is it very difficult to replace, it is to annoying to just leave it be.

jinman · Oct 24, 2012

Mike, they do make a repair kit for that portion of the loader valve. It's about $120 for the kit. Would you be putting the kit in yourself? Are you familiar with the online parts diagrams that New Holland has? I like the diagrams on messicks.com. They have lots of enhancements to New Holland's site and are sponsors here on TBN. You can order parts from them and have them shipped if you don't have a local dealer. Their site is tops.

If you go to this page on Messicks, you'll see a list of systems on the left hand side of the page. Click on "Hydraulic Systems" and a numbered list will appear with numbers from 07.01 to 07.12. Click on 07.11 to see your whole joystick and 07.12 to see the details of just the dual valve the joystick is attached to. On 07.12 diagram, item #15 is the detent repair kit.

If you are doing this job yourself, you might want to make sure all the parts are available when you start because it is quite an involved job. You'll have to do a lot of disassy/reassy. If you aren't comfortable doing that, you probably should get it done at a NH dealer's shop.

EDIT: BTW, how stiff is your rubber boot around the joystick base? You might remove that and see if it makes any difference. Sometimes when they get old and stiff, they can have enough backpressure to kick the joystick out of detent. Also, you may not need a repair kit. You miay get inside the valve and find it is just gummed up. Sometimes water can get into this area on the valves and will cause rusting or corrosion inside the end caps.

mikeevans · Oct 24, 2012

Thanks for the help. I think I'll try to clean it up myself and try the repair kit if needed. I've seen the diagram before but didn't now which kit was for the float. Thanks again.

mikeevans · Oct 25, 2012

Thanks for all the suggestions it ended up being the rubber boot. I had the plastic cover off for a couple weeks cleaning everything up and doing some maintenance, when I put it back on I thought I put it on the right way, so I switched it around until it stopped popping out and all good now. Thanks again.