U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-132
[3] Measuring the bent in the piston rod
1. Place the piston rod on a V block.
2. Put a dial gauge on the center of the rod.
3. While turning the piston rod, read the value
indicated by the dial gauge.
The bend is one-half of the difference between
the maximum and minimum readings.
4. If the bend exceeds the limit, replace the
piston rod.
Standard......value Bend: 0.05 mm or less
Limit ............. Bend: 0.5 mm
[4] Measuring the wear in the rod and bush
1. Measure the outside diameter of the piston rod
and the inside diameter of the bush of the
cylinder head section and determine the
clearance.
[5] Measuring the wear in the tube and piston
ring
1. Measure the inside diameter of the cylinder
tube.
2. Measure the outside diameter of the piston
ring and determine the clearance.
Rod size Gap
Standard value
φ25~40mm 0.25mm or less
φ45~75mm 0.35mm or less
Limit
φ25~40mm 0.4mm
φ45~75mm 0.5mm
Rod size Gap
Standard value
φ60mm or less 0.05~0.30mm
φ65~115mm 0.05~0.35mm
φ120mm or more 0.05~0.40mm
Limit
φ60mm or less 0.60mm
φ65~115mm 0.70mm
φ120mm 0.80mm
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