Hydro Speed Change
- Thread starter Steve_Miller
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CVHoss
Gold Member
Well, if my JD4400 HST has a clutch, I'd sure appreciate someone telling me where it is. /forums/images/graemlins/confused.gif
Hoss
Hoss
kensfarm
Veteran Member
I guess you haven't sat on a TC35D Hydro.. no clutch.. there are two ranges w/in each gear(2 gears) that you can change on the fly w/ out stopping.. the delux joystick contain a second set of high & low range buttons that make loader work very efficient. W/ the hydro I never use the brakes.. unless I want to get off the tractor w/ the engine running.. then I have to set the park brake. I wish they'd set up a TN or bigger size tractor w/ a hydro like the class III Boomers.
CTyler
Veteran Member
I always stop when changing ranges because they are not in sync. If your moving the gears will grind clutch or not. I don't usually use the clutch when changing ranges on my L3130. Most of the time it moves easily. Sometimes it takes a little coaxing however pushing the clutch doesn't seem to make a difference. Just roll the tractor in inch and all is well.
I'm not exactly sure why it has a clutch. Maybe you can get a little more PTO hp? for a generator etc.. when the tractor doesn't need to move. There is a little hook to hold the clutch peddle down.
I'm not exactly sure why it has a clutch. Maybe you can get a little more PTO hp? for a generator etc.. when the tractor doesn't need to move. There is a little hook to hold the clutch peddle down.
GareyD
Silver Member
- Joined
- Oct 20, 2003
- Messages
- 151
- Location
- Northwest Georgia
- Tractor
- Kubota GL 3430 - Massey TL30 - Ford 1700
I was told by the dealer that the hook was to used to keep the clutch disengaged when storing/not using the tractor for extended periods of time..keeps the plates from sticking/rusting together due to condesation in the fluids..
GaeryD
GaeryD
dltimmons
Bronze Member
GareyD,
You are correct, the little hook is used to disengage the clutch plates from the pressure plate when not using the tractor for any long period of time.
When working the tractor hard, the clutch, pressure plate get very hot. Then you shut off the tractor, it sits over a cold night, moist air condenses on the surfaces and starts to rust. If left for a long enough period of time, this rust will glue the face of the clutch plates to the pressure plate. The throw out bearing presses against the spring mounted clutch fingers, and will not break the clutch plates free of the pressure plate. WAL-AH no clutch. In extreme cases, you then have to break the tractor in half to free the clutch. Not Fun.
This applies to both Hydro and Gear drive tractors, and using this little lever is a real good idea if you know your not going to be using the tractor for a few days.
Never had this problem my self, but have helped several buddies who did.
See ya,
DT
You are correct, the little hook is used to disengage the clutch plates from the pressure plate when not using the tractor for any long period of time.
When working the tractor hard, the clutch, pressure plate get very hot. Then you shut off the tractor, it sits over a cold night, moist air condenses on the surfaces and starts to rust. If left for a long enough period of time, this rust will glue the face of the clutch plates to the pressure plate. The throw out bearing presses against the spring mounted clutch fingers, and will not break the clutch plates free of the pressure plate. WAL-AH no clutch. In extreme cases, you then have to break the tractor in half to free the clutch. Not Fun.
This applies to both Hydro and Gear drive tractors, and using this little lever is a real good idea if you know your not going to be using the tractor for a few days.
Never had this problem my self, but have helped several buddies who did.
See ya,
DT
CTyler
Veteran Member
I understand having the catch to hold the clutch down and the reasons listed here and in the manual. It just seems that you don't need the clutch at all. Thats why I wondered if you gained additional PTO hp.
755inNY
Platinum Member
- Joined
- Jul 4, 2003
- Messages
- 530
- Tractor
- JD 4310, ehydro, 4WD, R4s
<font color="blue"> for ALL hydrostatically controlled transmissions with more than 1 range (I've only seen 2 or 3 range hydros), a clutch is present. </font>
My JD 755 2 speed hydro has no clutch.
Jeff
My JD 755 2 speed hydro has no clutch.
Jeff
BillyP
Veteran Member
<font color="blue"> It just seems that you don't need the clutch at all </font>
That's a good question, C.
Now if someone could answer it /forums/images/graemlins/grin.gif
That's a good question, C.
Now if someone could answer it /forums/images/graemlins/grin.gif
dltimmons
Bronze Member
Hey guys and gals,
This is just speculation on my part, cause I really don't know.
I think? that the deciding factor, as to wether your hydro tran. tractor has a conventional clutch or not, may be related directly to the type of PTO on the tractor.
From my limited experiance, it apears that until recently, the hydro tractors mostly used a clutch to allow engagement/disengagement of the PTO. My old 87 MF 1010 was this way. I could shift from HI to Low range with out the clutch, as long as the tractor was stopped, but had to use the clutch to engage/disengage the PTO if the engine was running. I think that some of the newer tractors have an electric switch/clutch on the PTO that allows its' use with out having a separate clutch. My new 4310 is a gear drive, power reverser tranny, but the PTO has a separate electric clutch on it, and it makes no difference if the mechanical clutch is engaged or not. When you pull up on the PTO switch, the PTO is engaged. In gear, out of gear, moving, stopped, clutch in or out, PTO switch is pulled, and away it goes. While this is nice for mowing, the mower keeps working, (until you push the PTO switch off), it also means I cannot feather or regulate the PTO engagement. Even at idle, when you pull the PTO switch, it starts the output shaft abruptly. Bad enough to have sheared the pin on my deck 5 different times during one days mowing. With the PTO activated by a manual clutch, I could regulate power to the PTO and ease on the torque, making spin up of the mower a lot easier on the deck.
Anyway, my thoughts on the clutch/no clutch issue. Looks like it depends on the PTO and not the range change gearing. All of the tractors I am familiar with (not too many) in order to change speed range on the tranny, gear or hydro, the tractor had to be stopped because there are no snycros on this gear box and it is not meant to be shifted on the fly.
This is just my speculation and maybe some partially spoiled food for thought.
Other ideas? Any expert witnesses?
DT
This is just speculation on my part, cause I really don't know.
I think? that the deciding factor, as to wether your hydro tran. tractor has a conventional clutch or not, may be related directly to the type of PTO on the tractor.
From my limited experiance, it apears that until recently, the hydro tractors mostly used a clutch to allow engagement/disengagement of the PTO. My old 87 MF 1010 was this way. I could shift from HI to Low range with out the clutch, as long as the tractor was stopped, but had to use the clutch to engage/disengage the PTO if the engine was running. I think that some of the newer tractors have an electric switch/clutch on the PTO that allows its' use with out having a separate clutch. My new 4310 is a gear drive, power reverser tranny, but the PTO has a separate electric clutch on it, and it makes no difference if the mechanical clutch is engaged or not. When you pull up on the PTO switch, the PTO is engaged. In gear, out of gear, moving, stopped, clutch in or out, PTO switch is pulled, and away it goes. While this is nice for mowing, the mower keeps working, (until you push the PTO switch off), it also means I cannot feather or regulate the PTO engagement. Even at idle, when you pull the PTO switch, it starts the output shaft abruptly. Bad enough to have sheared the pin on my deck 5 different times during one days mowing. With the PTO activated by a manual clutch, I could regulate power to the PTO and ease on the torque, making spin up of the mower a lot easier on the deck.
Anyway, my thoughts on the clutch/no clutch issue. Looks like it depends on the PTO and not the range change gearing. All of the tractors I am familiar with (not too many) in order to change speed range on the tranny, gear or hydro, the tractor had to be stopped because there are no snycros on this gear box and it is not meant to be shifted on the fly.
This is just my speculation and maybe some partially spoiled food for thought.
Other ideas? Any expert witnesses?
DT