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How do I remove the sun gear? No bolts/clips on the cover!

Sniffy

Sniffy

Member
Joined
Oct 10, 2009
Messages
24
Location
Sumas, Wa
I have a dead ex-58mu Hitachi that I need to load up onto a ramp trailer. Normally I would unbolt the 6 or 8 bolts around the drive front cover then remove the sun gear. Temporary neutral.
This final drive is different. There are no bolts. There isn't a indented ring for a circlip or anything other than a thin seam showing around the face plate. The parts diagram suggests that there is a hidden wire clip behind the threaded face plate that acts like a lock ring.
Any idea how to put this machine into neutral or remove the front plate?
final drive.JPG
 
Sniffy

Sniffy

Member
Joined
Oct 10, 2009
Messages
24
Location
Sumas, Wa
Nope. Its not visible from the outside. This ring is internal. I tapped the assembly with a hammer to loosen it but nothing. The space between the round front cover and the side housing is the thickness of a business card, with no circlip
 
Cmark

Cmark

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Joined
Jan 2, 2009
Messages
3,188
Location
Australia
My best guess is that on assembly, the hook on wire 1 engages with the notch 2 and is wound in through the hole 3. Like on some cheap hydraulic cylinders.
Disassembly will be the reverse. Fish the end of the wire out through hole 3 and turn the cover.

1715926153094.png
 
Tones

Tones

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Mar 15, 2009
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3,164
Location
Ubique
Occupation
Ex land clearing contractor, part-time retired
Usually the ends of the wire locking ring is near the oil drain hole. With a small flat screwdriver or pick scratch around until you find the ends. Sometimes the wire hasn't been installed properly and is nowhere near the drain hole so find the end and mark its location. Then with a 3mm drill bore a hole no more than 10mm in from the outside of the barrel of the hub near the localition mark approx at 3 on Cmarks diagram. Now with a small diameter drift you can punch the wire out. Keep pressure on the the cover plate during this operation.
Don't ask how I know this shyt.
 
Sniffy

Sniffy

Member
Joined
Oct 10, 2009
Messages
24
Location
Sumas, Wa
This is the external view. Note the zero clearance between the housing and the cover.
 

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Sniffy

Sniffy

Member
Joined
Oct 10, 2009
Messages
24
Location
Sumas, Wa
Tones said:
Usually the ends of the wire locking ring is near the oil drain hole. With a small flat screwdriver or pick scratch around until you find the ends. Sometimes the wire hasn't been installed properly and is nowhere near the drain hole so find the end and mark its location. Then with a 3mm drill bore a hole no more than 10mm in from the outside of the barrel of the hub near the localition mark approx at 3 on Cmarks diagram. Now with a small diameter drift you can punch the wire out. Keep pressure on the the cover plate during this operation.
Don't ask how I know this shyt.
Click to expand...
The all knowing crystal ball says that there is a road trip to Kelowna BC in your near future...:p
 
Vetech63

Vetech63

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Joined
Aug 10, 2016
Messages
6,543
Location
Oklahoma
They are right about the circlip snap ring. It's very small diameter and only holds the cover in place. There is also a very small and thin oring seal. I'de bet that you are just not seeing it.
 
mg2361

mg2361

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Jul 5, 2016
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5,349
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Pennsylvania
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Equipment Mechanic
The cover comes off as Cmark said. What we do is weld some extensions onto plugs #5 (you will need new plugs after this), place the plugs with extensions back into their holes, then use a big pry bar to turn the cover to walk the ring out. You might have to tap the cover to break any rust free and spray generously with penetrating oil to help with the process.
 
skyking1

skyking1

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Joined
Nov 3, 2020
Messages
7,931
Location
washington
mg2361 said:
The cover comes off as Cmark said. What we do is weld some extensions onto plugs #5 (you will need new plugs after this), place the plugs with extensions back into their holes, then use a big pry bar to turn the cover to walk the ring out. You might have to tap the cover to break any rust free and spray generously with penetrating oil to help with the process.
Click to expand...
Back to my post about oil and tincture of time.
 
Tones

Tones

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Mar 15, 2009
Messages
3,164
Location
Ubique
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Ex land clearing contractor, part-time retired
Have you got that planetary hub apart yet?
You're going to need some info for reassemble so I won't do your head in just yet.
 
Sniffy

Sniffy

Member
Joined
Oct 10, 2009
Messages
24
Location
Sumas, Wa
Tones said:
Have you got that planetary hub apart yet?
You're going to need some info for reassemble so I won't do your head in just yet.
Click to expand...
I'm weenie-ing out. I'm looking for a crane truck to just lift it up and onto the deck.
 
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