U20-3, U25-3 WSM Machine body (Service section)
II-S-47
3) Idler
1. Idler
2. Check the floating seal and the shafts O-
ring for twist.
3. Apply lubricant to the floating seals sliding
surface and the shafts O-ring.
4. The lube oil to pour is Engine Oil Class
SAE#30CD. Its specified amount is 35 cc
for U-20-3 and 75 cc for U-25
5. The U-20-3 and U-25 are the same in
construction, but different in size.
4) Tension spring
1. Preset length of spring
174.3
±0.5m
* Make the setting at the split pin position
nearest to the above length.
No. Part No. Part name Q’ty Remarks
10 15521-96023 Plug (R1/8) 1
9 68171-21391 WIre 1
8 05411-00663 Spring pin 1 φ6×L63
7 04811-50250 O-ring 2 G25
6 RC301-21961 Bushing 2
5 RC301-21731 Seal (floating) 2
4RB411-2134Δ Idler 1
3RB411-2133Δ Shaft (Idler) 1
2RB411-2132Δ Bracket (2, Idler) 1
1RB411-2131Δ Bracket (1, Idler) 1
No. Part No. Part name Q’ty Remarks
16 05511-5043Δ Split pin 1 φ4×L35
15 68741-2142Δ Slotted nut 1
14 68171-2142Δ Spring 1
13 RB411-2144Δ Bolt (spring) 1
12 RB411-2149Δ Retainer 1
11 RB511-2148Δ Plate (idler) 1
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