Doosan DX225LC-3, Shop Manual

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SP002499 Travel Device
Page 56
Testing
The motor case must be filled up with a working fluid before
starting performance verification tests.
After completion of TM motor maintenance, the performance
verification tests listed below must be performed.
1. When a testing apparatus is available
If internal parts have been replaced, carry out running in
operation, followed by performance tests.
A. Conditions for running in operation
1) 20r.p.m, no-load pressure, 1 minute, clockwise/
counterclockwise rotation
2) 10r.p.m, 200 kg/cm
2
, 1 minute, clockwise/
counterclockwise rotation
3) 25r.p.m, no-load pressure, 1 minute, clockwise/
counterclockwise rotation
B. Conditions for performance tests
1) Working fluid : ISO VG #46 wear resistant type
2) Lubricating oil : Gear oil
3) Temperatures :
Ambient temperature -- Room temperature
Working fluid temperature -- 50 ± 5 degrees C
Casing temperature of reducer section -- 40 to
80 degrees C
4) Drainage pressure : 0.8 kg/cm
2
or less
C. Efficiency tests (for the first speed)
D. Second-speed volume efficiency verification tests
TM type
Volume efficiency Machine efficiency
External drainage amount
(Referential date)
89% or more 83% or more
TM40VD
Differential pressure : 250 kg/cm
2
Revolutions : 10rpm
2.0l/min or less
Second-speed selection Volume efficiency
Hydraulic motor drainge
amount
Differential pressure :80 kg/cm 2
Revolutions : 25rpm
95% or more 2.0l/min or less