2. SWING DEVICE 2.
SWING DEVICE WEARING PARTS 1) SLIDING PARTS 2) 7-20 Inspection item Standard dimension Recommended replacement value Counter measures Clearance between piston and cylinder block bore 0.028 0.058 Replace piston or cylinder block Play between piston and shoe caulking section (儑) 0 0.3 Replace assembly of piston and shoe Thickness of shoe (t) 5.5 5.3 Replace assembly of piston and shoe Combined height of retainer plate and spherical bushing (H-h) 6.5 6.0 Replace set of retainer plate and sperical bushing Thickness of friction plate 4.0 3.6 Replace 儑 t H h h Part name Standard roughness Allowable roughness Remark Shoe 0.8-Z (Ra=0.2) (LAPPING) 3-Z (Ra=0.8) Shoe plate 0.4-Z (Ra=0.1) (LAPPING) 3-Z (Ra=0.8) Cylinder 1.6-Z (Ra=0.4) (LAPPING) 12.5-Z (Ra=3.2) Valve plate 0.8-Z (Ra=0.2) (LAPPING) 6.3-Z (Ra=1.6)