TM 5-3805-281-24-2
Hydraulic System
33
HYDRAULIC SYSTEM WARM-UP PROCEDURE
3360
17
SPECIFICATIONS
viscosity oil to minimize warm-up period. (See
50 5C (120 10F)
Hydraulic Oil in Fuels and Lubricants Group.)
Hydraulic Oil Temperature
1. Connect digital thermometer. Install temperature
SERVICE EQUIPMENT AND TOOLS
probe on hydraulic tank-to-pump inlet line.
JT05800 Digital Thermometer
IMPORTANT: If the machine temperature is below
CAUTION: Avoid possible serious injury
-18 degrees C (0F), start the engine
from machine movement during warm-up
with the speed control in the idle
procedure. Clear the area of all bystanders
position. If the unit has been
before doing the warm-up procedure.
prepared for arctic operation with
the MIL-L-46167 hydraulic oil, the
2. Clear the area of all bystanders to allow for
suction strainer in the hydraulic tank
machine movement.
should also have been changed to
the coarser strainer for use in arctic
3. Start engine. Run engine at 1/2 speed for
conditions. Failure to do this could
approximately 5 minutes before operating any
cause the hydraulic pump to cavitate
functions. Do not run engine at fast or slow idle.
which can cause pump failure.
Operate engine at idle speed for at
4. Check that work mode is in Dig Mode and power
least 10 minutes before increasing
mode is in Standard Mode (no buttons pushed
the speed to half. Cover the radiator
down, indicators off). Push auto-idle switch to turn
and oil cooler debris screens to
off auto-idle function (auto-idle indicator off).
restrict the air flow for faster
warmup.
5. Slowly turn upperstructure so boom is to the side.
Below -18C (0F) an extended warm-up period may
CAUTION: Avoid possible serious injury
be necessary. Hydraulic function will move slowly and
from machine sliding backwards. Keep angle
lubrication of parts may not be adequate with cold oil.
between boom and arm at 90--110
Do not attempt normal machine operation until
hydraulic functions move at or close to normal cycle
6. Keeping the angle between boom and arm at 90--
times.
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.
For faster warm-up, restrict air flow through oil cooler
using cardboard or other similar material. Use correct
Continued on next page
TX,25,GG2232
1920NOV971/2
