When pushing snow with the loader bucket, I would like to speed up the bucket operation time. This tractor has every option but the mid pto. It has: eThrottle, MotionMatch, Accel/Decel, Cruise, etc. But nothing that I can find to make the loader raise & lower faster, and get a faster bucket dump. This is a 4720 cab machine with a 400cx loader. I must be over looking something ?
JD 4720: can I speed up the loader & bucket?
- Thread starter rdpowell
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- john deere 4720
kennyd
Advertiser
Are you running the throttle up near full RPM? That is the only real way to make it faster.
PILOON
Super Star Member
Mine was also very frustratingly slow.
I added a second pump which I drove from the crankshaft pulley.
On my tractor the manual showed a front PTO being driven that way, so I knew that it could handle that sort of loading.
From there on it is a simple mechanical adaption and plumbing exercise.
It has worked for about 14 years without a single issue.
The shaft driven unit is double the CC's of the engine one and therefore twice as fast.
I added a second pump which I drove from the crankshaft pulley.
On my tractor the manual showed a front PTO being driven that way, so I knew that it could handle that sort of loading.
From there on it is a simple mechanical adaption and plumbing exercise.
It has worked for about 14 years without a single issue.
The shaft driven unit is double the CC's of the engine one and therefore twice as fast.
9973720wb19
Platinum Member
I thought if you changed the setting on the Dual Selective Control Valve under the SCV, you could get the bucket to move faster? It's on page 42 of my 4720 manual. "Position F will dump more rapidly...
Position F would be the regen function. It ports oil from the rod side of the bucket cylinders directly back to the piston end, reducing the hesitation associated with lower volume hydraulic systems. No flow control valve on that system.
A John Deere Guru told me one time that John Deere had started installing a Orifice in one of the lines going forward to the bucket. He advised the orifice most times was in the "Green Cap" line what ever that means. He advised the orifice is inserted in the line where it changes from steel to rubber and the majority of the time the bottom line looking downard is the one with the orifice. He seemed to think, removal or modification (ream out hole in orifice) would increase loader, raising and dumping speeds. I personally have not had a conservation with anyone who has removed or modified one of the orifices.
This is a method often used, although I do not see one in the parts blow-out. It wouldn't hurt to relieve the pressure on the lines and open them up to check for the restriction orifice. It wouldn't be the first time Deere left a small part out of the parts manual.
Red Horse
Veteran Member
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RD- Check out the thread I started on "JD Buying etc" under "Hydro vs Power Reverser". Lots of good comments /opinions.
orlo
Platinum Member
You know lately I've been thinking something is wrong with my 4720 since it seems to dump slow when there isn't much weight in the bucket - I see I'm not alone. Using it when the outside temp was below -20 I'm sure didn't help since it would make the hydraulic fluid thick.
And the fluid in those cylinders probably never warms up with my level of use.
And the fluid in those cylinders probably never warms up with my level of use.
