Pump Maintenance Criteria; Worn Part Replacement Criteria - Doosan DX140R Shop Manual

PUMP MAINTENANCE CRITERIA

Worn Part Replacement Criteria

When a part exceeds any of the following criteria, replace of
readjust it.
However, when a part is damaged seriously in appearance,
replace it without fail.
Part name & inspection
Clearance between Piston &
cylinder bore (D-d)
Play between piston &
shoe0calking section (δ)
Thickness of shoe (t)
Free height of cylinder spring (L)
Combined height of set plate &
spherical bush (H-h)
Clearance between piston &
cylinder bore (D-d)
t
Play between piston & shoe :
Thickness of shoe : t
Figure 24
Main Pump
Standard Dimension /
Recommended replacement vale
Pump type
0.032 / 0.056
0~0.1 / 0.3
41.1 / 40.3
17.0 / 15.8
d
D
K7V63
3.9 / 3.7
Free height of cylinder spring : L
Combined height of set plate &
spherical bush : H-h
Countermeasures
Replace piston or cylinder.
Replace assembly of piston &
shoe.
Replace assembly of piston &
shoe.
Replace cylinder spring.
Replace set plate or spherical bush
L
h
H
FG015048
SP001945
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