U20-3, U25-3 WSM Machine body (Service section)
II-S-49
4) Track roller disassembling procedure
1. Check the roller surface and shaft for wear,
and measure the outside diameter, as
required. If out of spec, replace them with
new ones.
2. In reassembling, be careful to keep the
roller inside and incoming parts free from
dust, cuttings and other foreign matters.
3. The lube oil to pour is Engine Oil Class
SAE#30CD. Its specified amount is 50 cc.
4. The U-20-3 and U-25 are the same in
construction, but different in size.
1. Press-fit the bushing in position.
2. The bracket and shaft are press-fitted in
place at one side. A press is needed in
order to detach and attach them.
3 Apply the lube oil to the O-ring of the shaft.
CAUTION
In disconnecting the anti-fall wire, keep in mind
that the wire may pop out.
1. Check the O-ring of the floating seal for
dust and oily deposits.
Install the seal in place without twist and
tilt.
2. Apply the lube oil thinly over the seal
sliding surface.
3. Finally move the seal 2 or 3 turns to see if it
turns smoothly. This also helps form an oil
film over the seal sliding surface.
Part No. Part name Q’ty
RB511-21751 Roller 1
Roller A 1
Roller B 1
RC411-21722 Shaft 1
RB511-21711 Collar A 1
RB511-21781 Collar B 1
RC301-21961 Backup ring 2
RC301-21731 Floating seal 2
RC301-21861 Ring,stopper 1
04811-50250 O-ring 1
15521-96023 Plug 1
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