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7-13
DIG FUNCTION DRIFT CHECK
Measure dig function drift, which can be
caused by oil leakage in the control valve
and boom, standard arm, and standard
bucket cylinders, with the loaded bucket.
When testing the dig function drift just
after cylinder replacement, slowly operate
each cylinder to its stroke end to purge air.
Preparation
Load bucket fully. Instead of loading the
bucket, weight(W) of the following
specification can be used.
W=M
3
×
1.5
Where :
M
3
= Bucket heaped capacity (m
3
)
1.5= Soil specific gravity
Position the arm cylinder with the rod 20
to 30 mm extended from the fully
retracted position.
Position the bucket cylinder with the rod
20 to 30 mm retracted from the fully
extended position.
With the arm rolled out and bucket rolled
in, hold the bucket so that the height of
the bucket pin is the same as the boom
foot pin.
Keep the hydraulic oil temperature at
50
±
5˚C.
Measurement
Stop the engine.
Five minutes after the engine has been
stopped, measure the changes in the
positions of the boom, arm and bucket
cylinders.
Repeat step
②
three times and calculate
the average values.
10)
(1)
(2)
①
·
②
③
④
⑤
(3)
①
②
③
The measured drift should be within the following specifications.
Unit : mm / 5min
Model
HX130CR
HX130LCR
Drift to be measured
Boom cylinder
Arm cylinder
Bucket cylinder
Standard
10 below
10 below
40 below
Maximum allowable
20
20
50
Remarks
(4)
145ZF7MS11
Summary of Contents for HX130 LCR
Page 11: ...1 1 SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10 ...
Page 174: ...4 5 MEMORANDUM HYUNDAI HEAVY INDUSTRIES CO LTD CONSTRUCTION EQUIPMENT DIV ...
Page 536: ...8 108 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29 ...
Page 566: ...8 138 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10 ...