Doosan DX480LC - Cylinder Performance Tests

SP002026
Page 25
Specification for DX300LCA
Cylinder Performance Tests
NOTE: All tests are performed with standard boom, arm and
bucket configuration. The bucket should be empty.
Boom Cylinders Test
The starting points for the test are with the boom and arm
extended away from the excavator, and the bucket curled
inward. The arm cylinder should be fully retracted; boom and
bucket cylinders must be extended. Test movement in both
directions, several times, and average results for both Standard
Mode and Power Mode.
Arm Cylinder Test
Start with the boom up and the arm cylinder fully retracted. Test
movement in both directions several times, between the "crowd"
and "dump" positions, and average the results of both tests, in
both standard and extra-duty power modes.
Bucket Cylinder Test
Start with the boom up and the teeth of the bucket hanging
vertically, 500 mm (1-1/2' - 2') above the ground. Dump and
crowd the bucket several times, and average results, for both
standard and extra-duty power modes.
Hydraulic Cylinder Natural Drop Test
To check boom and arm cylinder tightness against the specified
performance standard for new cylinders, put a full load of dirt in
the bucket and move the attachment cylinders so that the arm
cylinder is extended 20 - 50 mm (1" - 2") and boom cylinders are
retracted the same amount, 20 - 50 mm (1" - 2"). The top of the
bucket should be approximately 2 m (6' - 7') off the ground.
Shut down engine and measure cylinder drop after 5 minutes.
Bucket cylinder should not show more than 40 mm (1.57")
change, while the arm and boom cylinders should not fall more
than 10 mm (0.39").
Travel Motor Jack-up Test
Test travel motor operation on each side by painting or chalking
a mark on one crawler shoe, with a corresponding mark on the
travel frame. Use the attachment to jack up one side of the
machine and operate the raised travel motor. Record the
number of seconds it takes the crawler shoe to make 3 full
rotations, during both high speed and low speed operation.
Operation Standard Mode Power Mode
Boom Up 3.2 - 4.0 sec 2.9 - 3.7 sec
Boom Down 2.4 - 3.0 sec 2.2 - 2.8 sec
Arm Dump 2.6 - 3.2 sec 2.5 - 3.1 sec
Arm Crowd 3.7 - 4.5 sec 3.4 - 4.2 sec
Bucket Dump 2.6 - 3.2 sec 2.4 - 3.0 sec
Bucket Crowd 2.6 - 3.4 sec 2.3 - 3.1 sec
Operation Standard Mode Power Mode
High Speed 21.8 - 23.8 sec 20.2 - 23.2 sec
Low Speed 37.8 - 40.8 sec 35.3 - 39.3 sec