hornbeak
New member
I have a 3320 compact John Deer tractor that must be running at 2000 rpm plus for power steering and all hydraulics to including forward and backward motion to operate. Any suggestions before I change out the hydraulic pump?
hornbeak
- Thread starter hornbeak
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the old grind
Elite Member
- Joined
- Jul 21, 2012
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- 4,406
- Location
- Mid-Michigan
- Tractor
- NH T-1520 HST, NH TC33DA HST, Case DX26 HST, .Terramite T5C, . NH L785
Last filter change? Hydro level ok?
All QD hoses fully connected/seated? Any accessories connected to power beyond?
btw, :welcome:
All QD hoses fully connected/seated? Any accessories connected to power beyond?
btw, :welcome:
LD1
Epic Contributor
Suction leak?
Have you put a pressure gauge on it?
Have you cracked a hose open and see if its flowing just not developing pressure?
Have you put a pressure gauge on it?
Have you cracked a hose open and see if its flowing just not developing pressure?
kennyd
Advertiser
Yes, much needs to be determined before replacing (expensive) parts. The two hydraulic pumps do not provide forward/reverse motion anyway, the hydrostatic transmission does so, but they all share a common sump.
Is the fluid clean and clear? Is it foamy looking after running?
Is the fluid clean and clear? Is it foamy looking after running?
LD1
Epic Contributor
I overlooked the forward and back part....
So no HST, No power steering, and no 3PH/FEL operation at anything under 2000rpm.......
I cannot attest to the 3320, but "most" tractors have more than one pump to handle all that, like KennyD said. Your issue isnt a pump.
How many hours on the tractor? When was the last fluid and filter change? What type of fluid did you use? Is the fluid level low?
Way to many unanswered questions that I would address before tearing into a pump.
So no HST, No power steering, and no 3PH/FEL operation at anything under 2000rpm.......
I cannot attest to the 3320, but "most" tractors have more than one pump to handle all that, like KennyD said. Your issue isnt a pump.
How many hours on the tractor? When was the last fluid and filter change? What type of fluid did you use? Is the fluid level low?
Way to many unanswered questions that I would address before tearing into a pump.
Thanks for the pump information. The history is; last fall I changed the suction filter and hydraulic oil. I went to dealership to get both. I was given Hy-Guard hydraulic oil. After a month or so I noticed the tractor did not move very quickly when cold. Just cold I thought. I still had about one half gallon left of the oil. Read on the label and it was not low viscosity oil. Fearing the wrong type oil in tractor, picked up new oil (low viscosity) and new filter. The hydraulics are getting worse every use. I have checked the level many times. The oil on the hydraulic dip stick is very clear. The tractor has 1600 hours. Don't know what to check. After reading on Tractor by Net I am about convinced there is a suction problem either a hole or connection not seated well. I am about to drain the hydraulic oil to check filter and suction pipe for proper seat. After all this history can anyone offer a different solution?
kennyd
Advertiser
There is little difference in the regular Hygard and the low-vis flavor, is should make no real difference. I would pull the filter and screen though, just to make sure it's still clear.
If there is suction side leak, then the fluid is usually foamy after running. One common failure point is the "manifold", part #21 (M134346) below, it can get hard and crack causing the system to suck air with no visible leaks. Next step is to get a tech manual and a pressure gauge to run some tests.
If there is suction side leak, then the fluid is usually foamy after running. One common failure point is the "manifold", part #21 (M134346) below, it can get hard and crack causing the system to suck air with no visible leaks. Next step is to get a tech manual and a pressure gauge to run some tests.
Well I changed the hydraulic oil and filter again. This time I carefully placed the filter until it went in with little pushing pressure. Refilled the hydraulic fluid to the full mark. It seems to be better although not working correctly. Will try looking at the manifold for cracks, etc. I think I went to source of the problem which is the hydraulic filter placement. Thank each and every one that has commented.
Turned out to be the manifold had a crack and tractor responded different with the temperature. Changed the manifold and everything works great. Thanks to Tractor By Net members for the help. I learned a little more about this tractor. Not a good idea to trade tractors when you have knowledge of the one you own..old timers kept the same old tractors for years because they learned how to work on and fix the tractor they had.