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Old 04-07-2012, 02:08 AM
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Default Hydro Drain Plug?
Ok. The early gear drives have a transmission drain plug, which makes changing fluid easy, so why were the hydros not built with a similar drain plug?

I un bolted one of my lines to drain my hydro and after re-assembly, it leaks. I have re-tightened it and wondered if I could/should use teflon tape to stop the leak or how/why it is leaking. Any assistance is appreciated. Thanks in advance for your suggestions/comments.

Cub Cadet 123
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Old 04-07-2012, 08:09 AM
Methos Methos is offline
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Ok. The early gear drives have a transmission drain plug, which makes changing fluid easy, so why were the hydros not built with a similar drain plug?

I un bolted one of my lines to drain my hydro and after re-assembly, it leaks. I have re-tightened it and wondered if I could/should use teflon tape to stop the leak or how/why it is leaking. Any assistance is appreciated. Thanks in advance for your suggestions/comments.

Cub Cadet 123
The drain plug is the rear cover. The plug that is higher up is how you fill it up and check it's level.
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Old 04-07-2012, 08:22 AM
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Originally Posted by Cub Cadet 123 View Post
Ok. The early gear drives have a transmission drain plug, which makes changing fluid easy, so why were the hydros not built with a similar drain plug?

I un bolted one of my lines to drain my hydro and after re-assembly, it leaks. I have re-tightened it and wondered if I could/should use teflon tape to stop the leak or how/why it is leaking. Any assistance is appreciated. Thanks in advance for your suggestions/comments.

Cub Cadet 123
I am cautious when using teflon tape.

Many people think it is a fluid sealant, it is a friction reducer!!

The teflon tape allows you to easily tighten threads with less torque, great for black steel/iron pipe and fittings with tapered threads.

The tape can easily allow the user to tighten hydraulic fittings so tight, the threads become damaged.

Also, since it reduces friction, it allows the assembly to vibrate loose easily!!

My teflon tape stays in the toolbox, except for tapered pipe threads.

As for why it is leaking, I would look for a scratch or a cracked tube/fitting.

Typically, hydraulic leaks require a new fitting. Another possibility is misalignment during assembly.
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Old 04-08-2012, 12:04 PM
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The drain plug is the rear cover. The plug that is higher up is how you fill it up and check it's level.
Duke,

I was wondering why they didn't put a drain plug in the bottom of the transmission so that you would not have to remove the rear cover plate to get the fluid out. If I remove the rear cover plate, then will I need to necessarily replace the gasket if it is still good? I just thought it would be easier if there was a plug in the hydro transmissions like for the gear drives.

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Old 04-08-2012, 12:09 PM
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Duke,

I was wondering why they didn't put a drain plug in the bottom of the transmission so that you would not have to remove the rear cover plate to get the fluid out. If I remove the rear cover plate, then will I need to necessarily replace the gasket if it is still good? I just thought it would be easier if there was a plug in the hydro transmissions like for the gear drives.

Cub Cadet 123
To amke you clean out the rear carrier if needed. I'm just taking a stab at that one as it sounded good.
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Old 04-08-2012, 06:24 PM
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if you took off the siphon tube . put a new (I call it a pinch ring) once they crush from over tightening them , they leak. the oil isnt running out threw the treads. it runs out around the outside of the pipe.
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Old 04-08-2012, 10:21 PM
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if you took off the siphon tube . put a new (I call it a pinch ring) once they crush from over tightening them , they leak. the oil isnt running out threw the treads. it runs out around the outside of the pipe.
+1...those compression sleeves are only supposed to be used once.
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Old 04-08-2012, 10:35 PM
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Thanks Doug and Matt.....I didn't know that and didn't replace it, so that's why my garage floor is full of hydrotran fluid. I thought that I might have a piece of dirt in the fitting or something like that.

Still, does anyone know why the engineers wouldn't have put a drain plug in the hydros? Just curious.....

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Old 04-08-2012, 10:41 PM
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Still, does anyone know why the engineers wouldn't have put a drain plug in the hydros? Just curious.....

Cub Cadet 123
cost and time.

my 70's GM rear diff's dont have a drain. you got to pull the cover to let it out.
9" fords dont have one either, and no cover. you got to pull the pig to drain them.
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Old 04-08-2012, 10:42 PM
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Thanks Doug and Matt.....I didn't know that and didn't replace it, so that's why my garage floor is full of hydrotran fluid. I thought that I might have a piece of dirt in the fitting or something like that.

Still, does anyone know why the engineers wouldn't have put a drain plug in the hydros? Just curious.....

Cub Cadet 123
Prolly, cause we can attest a hydro will go 30 years with factory oil so why spend the cost of a drill/Tap operation and a plug, it all adds up to $$$.
Just like they eliminated Zerk fittings because folks didn't grease them.
The compression sleeves are also called "ferrules"
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