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Case 450 dozer transmission activation hydraulics

R

roaty1954

New User
OK, I've a Case 450 dozer '76. The dozer sat for about 10 years. I went through all the hoses, fiters and new oil and got everything good. so, when I engage the control levers H/L only one side, the left side engages. Trans pressture excellent. the next place for me to get into is pull the cover off the right side hydraulic circuit, From here out I'm clueless. Is it possible that contamination has froze something?

Looking for any advice at this point.
 
The RH clutch pack could be stuck in neutral, does the pressure gauge fluctuate when you shift it like it does when you
shift the LH one?
 
Check the linkage is moving the control valve,see the brake cutout for that side is not engaged,open the bleed nipple on the cylinder,it should not have pressure.
AJ
 
(quoted from post at 02:52:23 08/04/19) Check the linkage is moving the control valve,see the brake cutout for that side is not engaged,open the bleed nipple on the cylinder,it should not have pressure.
AJ
Click to expand...

OK, lets see if I have this right. When you say linkage moving control valve, I'm thinking the right hand HI/LO control stick that moves the slider bar back and forth which allows hydraulic pressure to the clutch packs. This is for some reason not getting pressure.

Now, I can make right hand hard turns with the foot brake not problem. Am I missing this "brake cutout" thing/not understanding that is somehow connected to the hydraulic pressure issue? I have replaced all the brake lines, master cyl. and slave cly. Cleaned up the brake circuit, could this be my problem?

Thanks for the first reply.
 
(quoted from post at 02:52:23 08/04/19) Check the linkage is moving the control valve,see the brake cutout for that side is not engaged,open the bleed nipple on the cylinder,it should not have pressure.
AJ
Click to expand...

OK, lets see if I have this right. When you say linkage moving control valve, I'm thinking the right hand HI/LO control stick that moves the slider bar back and forth which allows hydraulic pressure to the clutch packs. This is for some reason not getting pressure.

Now, I can make right hand hard turns with the foot brake not problem. Am I missing this "brake cutout" thing/not understanding that is somehow connected to the hydraulic pressure issue? I have replaced all the brake lines, master cyl. and slave cly. Cleaned up the brake circuit, could this be my problem?

Thanks for the first reply.
 
The brake cutout was optional, you may or may not have one. Those control valve spools were three piece, with a snap ring in the middle, holding the two ends together. If you loose the ring it will still shift in to high range but not low or neutral. Does Your pressure gauge wiggle when you shift that leaver, if not that spool might be separated.
 
Probably all that right brake is doing is stopping the right track from freewheeling so the left track can bring you around.
 
(quoted from post at 12:43:17 08/06/19) Probably all that right brake is doing is stopping the right track from freewheeling so the left track can bring you around.
Click to expand...

I know that when I press on the foot brake left side, it cuts the power to that track then a little harder and the brake stops the track.

I'm a few days away from getting back on this project. I'll be into the pressure gauge movement when I shift the left track and then compare to the right track. Go from there. I'll keep you posted, plus I'll try to post up pictures next time around.
 
Check the brake /Hyd valve for that side.

It's located on top side of the trans. valve body.

There are two one on each side for L/R

Will have small 1/8 " line connected to it from the brake Cyl.

It could be stuck open.

Good Luck,Tom
 
(quoted from post at 17:56:50 08/16/19) Check the brake /Hyd valve for that side.

It's located on top side of the trans. valve body.

There are two one on each side for L/R

Will have small 1/8 " line connected to it from the brake Cyl.

It could be stuck open.

Good Luck,Tom
Click to expand...

OK, thanks. Update.

I pulled the whole hydraulic/brake activation control circuit out and have gone through it to make sure all items are working properly. I really didn't find anything that was keeping the hydraulic circuits from operating properly. I'm getting a new seal for the brake activate/deactivate plunger, but I don't think that was the issue. I'll update when I have it back together.

Thanks all for your input.
 
Sounds Good.

FYI,
Make sure the brake master Cyl. is completely releasing.

I have seen where the master was holding residual pressure on
The system not enough to drag the brake, but enough to trip the clutch valve, causing a no pull situation.

Just something to check and eliminate before going into the clutches.

Tom
 
(quoted from post at 19:11:54 08/16/19) Sounds Good.

FYI,
Make sure the brake master Cyl. is completely releasing.

I have seen where the master was holding residual pressure on
The system not enough to drag the brake, but enough to trip the clutch valve, causing a no pull situation.

Just something to check and eliminate before going into the clutches.

Tom
Click to expand...

It's possible that the brake slave had been stuck. I'm hoping that's the issue. everything moves freely now. just waiting for the slave cylinders seal. I hope the clutch valve is not the issue... what a pain to pull...
 
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