Servicing the right and hydrostatic transmission - Snowblower Forum : Snow Blower Forums
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post #1 of 68 Old 11-19-2014, 05:28 AM Thread Starter
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Servicing the right and hydrostatic transmission (Pictures re-uploaded 10/28/18)

EDIT (10/29/2018): All the pictures were recovered and re-uploaded onto SBF site, enjoy.



This thread is for general discussion concerning the right transmission and the hydrostatic transmission found on most track/wheel assisted HS series snow blowers. Someone correct me if I am wrong but the right transmission might only be for the track assisted machines.

Current condition of the right/final gear transmission. While overhauling the blower I noticed the rubber seal, part#15 in the illustration below, had perished. I suspected it let dirt in the casing, which was later affirmed when I opened the case.

- Notice the contaminated grease.
- Bearings are fine.
- Can anyone point out what type of grease Honda has used in the gear case?

- I intend on replacing the grease.
- Change part #14
- Install new gasket, part #2.








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Last edited by JnC; 10-29-2018 at 07:54 PM.
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post #2 of 68 Old 11-19-2014, 05:53 AM Thread Starter
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Hydrostatic transmission

The main reason I had the snow blower pulled apart is to rectify the leak that the hydrostatic transmission has developed. Fluid had accumulated all around the transmission case and over the years turned into gunk due to the dirt from the surroundings. I couldnt really pin point the exact location of the leak but it seems that the oil seals are weeping.



Illustrations from the shop manual, courtesy [email protected]







here is how the transmission looks right now, its been slightly cleaned to rid some of the gunk on it.

Notice the seals around the drive shaft, pulley shaft and the dust cap on the engage/disengage lever. (part #49, 51 and 50 in the illustration above), also notice the gaskets between the rear casing and distributor plate along with gasket between front casing and distributor plate (part # 3 and 14 in the illustration above).

engage/disengage lever



right side drive shaft seal



left side drive shaft seal



pulley side seal



this picture show the two gaskets sandwiched between the three pieces of transmission case (back, distributor and front)

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Last edited by JnC; 10-29-2018 at 06:46 PM.
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post #3 of 68 Old 11-19-2014, 06:04 AM Thread Starter
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The illustrations above are to aid taking the transmission off of the chassis and disassembling it, I have asked Robert if he can kindly provide the shop manual section on reassemble as well since I'll need the torque specs on the housing bolts.
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post #4 of 68 Old 11-19-2014, 06:46 AM
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I would use a high molybdenum grease or a synthetic molybdenum grease. The grease that they used just by it's looks, looks like cheap common grease. Thanks for this post, the pictures will help me find the best spot to drill a grease hole in the gearbox while it is still in the snowblower. I have choosen to NOT add a grease zerk after drilling my access hole to keep as much aluminum chips out of the case. I will use a grease needle to inject grease into gearbox and then seal the small hole with Permatex High Temp silicone because it seals far better then their common cheap stuff that is worthless as a silicone sealer. http://www.californiaperformance.com...edle%20tip.jpg .
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post #5 of 68 Old 11-19-2014, 08:45 AM Thread Starter
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Quote:
Originally Posted by Apple Guy View Post
I would use a high molybdenum grease or a synthetic molybdenum grease. The grease that they used just by it's looks, looks like cheap common grease. Thanks for this post, the pictures will help me find the best spot to drill a grease hole in the gearbox while it is still in the snowblower. I have choosen to NOT add a grease zerk after drilling my access hole to keep as much aluminum chips out of the case. I will use a grease needle to inject grease into gearbox and then seal the small hole with Permatex High Temp silicone because it seals far better then their common cheap stuff that is worthless as a silicone sealer. http://www.californiaperformance.com...edle%20tip.jpg .

I'll look into that and yes the grease does feel/looks like it has passed its prime.

My only gripe with the design is the lack of a seal towards the inside of the shaft and also where the shaft from the hydro transmission comes in. As you can see form the pictures moisture/dirt has gotten in from both sides of the shaft, one side is due to the dust seal perishing and the other side from not having a seal at all.


I was also thinking about installing a quick release grease fitting, something similar to the ones I have on my JD Z445 lawn mower spindles.






and here is the grease/grease gun I use, makes greasing the spindles a breeze, couple of pumps every 5~10 hours.

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Last edited by JnC; 10-29-2018 at 06:47 PM.
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post #6 of 68 Old 11-21-2014, 08:50 AM Thread Starter
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Got the scans from the shop manual, thanks again [email protected]

I cleaned up all the parts in the right transmission, just waiting on parts to come in before I put it back together.

Does any one know how much I need to torque the transmission bolts when putting the hydro back together? I havent opened it yet, waiting on the seals and gaskets to come in before i open it, change the gaskets and bolt it back together in one sitting.
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post #7 of 68 Old 11-21-2014, 08:58 PM
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Here is a metric torque chart using foot\lbs.
Metric Bolt Torque Table - CNCexpo.com

Toro 8/24 (38080) 1989
Toro 421-QZE (38585) 2008 (Gone)
Toro 721-QZR (38741) 2015 (Hemi Predator Power)

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post #8 of 68 Old 11-22-2014, 12:26 PM Thread Starter
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Quote:
Originally Posted by Grunt View Post
Here is a metric torque chart using foot\lbs.
Metric Bolt Torque Table - CNCexpo.com

Thank you , also got this from [email protected]

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post #9 of 68 Old 11-29-2014, 12:19 PM Thread Starter
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So the parts finally came in and I got cracking on the service. After getting the transmission on the bench I cleaned it up real good and tried to inspect everything. Upon close inspection it turns out that the main gaskets are not the cause of the weeping/leak. The three oil seals around the main shaft, pulley shaft, faulty O ring around the neutral lever and the dust seal around the neutral lever need to be changed to rectify the issue.

While changing the seals I also came to the conclusion that the seals are meant to weep over time as there is no way they can keep all the fluid inside the transmission over the life of the snowblower. I'd also like to mention here that the transmission worked flawlessly before I decided to service everything.

I did however replace and bleed the transmission with all new Honda Hydrostatic fluid.

On the bench



Dust seal removed along with the neutral lever.



Neutral lever (notice the O ring around it, the O ring was also replaced)






The lever, new seal and a 10 mm socket to push the seal in place.




lever installed back



seal installed, also showing the socket





same process was used to replace the seals around the shaft and pulley shaft.

Here is an image showing the right side of the transmission with the seal removed.

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Last edited by JnC; 10-29-2018 at 06:49 PM.
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post #10 of 68 Old 11-29-2014, 12:28 PM Thread Starter
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Gearcase rebuild

The gear case and all its components were cleaned thoroughly and all the old contaminated grease was replaced with new grease along new dust seal.

All parts cleaned and ready to go



bearings installed



all components put back together, the shop manual indicates where to apply new grease, which is pretty much everywhere.



back side



outside, notice the new seal, I am still not sold on the idea of this seal keeping all the elements out as it doesnt snap into anything, more of a floating seal.

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Last edited by JnC; 10-29-2018 at 06:51 PM.
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