TM 5-3805-280-24-1
Tests
HYDRAULIC SYSTEM WARM-UP PROCEDURE
SPECIFICATIONS
For faster warm-up, restrict air flow through oil cooler
50 5C (120 10F)
using cardboard or other similar material. Use correct
Hydraulic System Warm-Up Oil
Temperature
viscosity oil to minimize warm-up period. (See
Hydraulic Oil in Group 9000-04.)
SERVICE EQUIPMENT AND TOOLS
1. Connect digital thermometer. Install temperature
JT05800 Digital Thermometer
probe on hydraulic oil tank-to-pump inlet line. (See
JT05800 Digital Thermometer Installation in this
IMPORTANT: If the machine temperature is below
-18 degrees C (0F), start the engine
group.)
with the speed control in the idle
position. If the unit has been
CAUTION: Avoid possible serious injury
prepared for arctic operation with
from machine movement during warm-up
the MIL-L-46167 hydraulic oil, the
procedure. Clear the area of all bystanders
suction strainer in the hydraulic tank
before doing the warm-up procedure.
should also have been changed to
the coarser strainer for use in arctic
2. Clear the area of all bystanders to allow for
conditions. Failure to do this could
machine movement.
cause the hydraulic pump to cavitate
which can cause pump failure.
3. Start engine. Run engine at 1/2 speed for
Operate engine at idle speed for at
approximately 5 minutes before operating any
least 10 minutes before increasing
functions. Do not run engine at fast or slow idle.
the speed to half. Cover the radiator
and oil cooler debris screens to
4. Check that work mode is in Dig Mode and power
restrict the air flow for faster
mode is in Standard Mode (no buttons pushed
warmup.
down, indicator lights off). Push auto-idle switch to
9025
25
turn off auto-idle function (auto-idle indicator off).
Below -18C (0F) an extended warm-up period may
36
be necessary. Hydraulic function will move slowly and
5. Slowly turn upperstructure so boom is to the side.
lubrication of parts may not be adequate with cold oil.
Do not attempt normal machine operation until
CAUTION: Avoid possible serious injury
hydraulic functions move at or close to normal cycle
from machine sliding backwards. Keep angle
times.
between boom and arm at 90--110
Hydraulic System Warm-Up Oil--Specification
6. Keeping the angle between boom and arm at 90--
Temperature .................................................... 50 5C (120 10F)
110, lower boom to raise one track off the ground.
Operate functions slowly and avoid sudden
7. Operate propel function for approximately 5 minute.
movements until engine and hydraulic oils are
thoroughly warmed. Operate a function by moving it a
8. Once oil temperature is above -18C (0F), increase
short distance in each direction. Continue operating
engine speed to fast idle.
the function increasing the distance traveled in each
cycle until full stroke is reached.
Continued on next page
TX,25,GG2232 1913AUG981/2
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