10 - 1
Introduction
It is important before taking measurements that control
conditions are maintained.
a Position the machine on a level safe site.
b Adhere strictly to the safety operation.
c Confirm the setting when an adjustment is made.
The items to prepare are:-
a The check sheet
b Tape measure
c Dial gauge with magnetic stand
d Angle gauge
e Chalk
f Stop watch
Basic Measurement Conditions
When checking the performance valve, certain vehicle
conditions should be fulfiled:-
a The vehicle should be in the S mode.
b The hydraulic oil temperature should be 45°C-55°C.
c The engine speed should be within ±50 rpm of the
reference value.
d The hydraulic equipment should be operated
several times before testing.
e The operation to be measured should be operated
three times and an average taken.
f Measure on level hard ground.
These consist of two basic types of measurement:-
1 Speed Measurements
a Bucket ram speed.
b Dipper ram speed.
c Boom ram speed.
d Slew speed.
e Travel speed.
2 Other Measurements
a Travel linearity.
b Slew backlash.
c Lateral movement in turntable bearing.
d Slew brake.
e Slew lock characteristics.
f Natural internal leakage, natural ram drop.
g Ram piston rod seal leakage.
Section 3 Routine Maintenance
9803/6410
Section 3
10 - 1
Issue 1
Performance Evaluation
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