
156
Maintenance Section (D6T LGP (OEM)) WEBM1000
Hydraulic System Oil - Change
• Oils that meet the Cat TO-4 performance
requirements that have a minimum zinc additive
level of 0.09 percent (900 ppm)
Note: In
dustrial hydraulic oils are not recommended
for the hydraulic systems
of Caterpillar machines.
Industrial hydraulic oils are more likely to allow
corrosion and industrial hydraulic oils are more likely
to allow excessive wear.
Change the Hydraulic Oil
At operating temperature, the hydraulic tank is
hot and under pressure.
Hot oil and components can cause personal
injury. Do not allow hot oil or components to
contact skin.
Remove the filler cap only when the engine is
s
topped, a
nd the filler cap is cool enough to
touch with your bare hand. Remove the filler cap
slowly in order to relieve pressure.
NOTICE
Care must be taken to ensure that fluids are
contai
ned during performance of inspection,
maintenance, testing, adjusting, and repair of the
product. Be prepared to collect the fluid with suitable
containers before opening any compartment or
disassembling any component containing fluids.
Refer to Special Publicat
ion, NENG250
0 “Dealer
Service Tool Catalog” for tools and supplies suitable
to collect and contain fluids on Cat products.
Dispose of all fluids according
to local regulations
and mandates.
Operate the machine in order to warm the oil.
Park the machine on level ground. Lower the
bulldozer blad
e to the ground and apply slight
downward pressure. If equipped, lower the ripper to
the ground. Engage the parking brake and stop the
engine.
206
Illustration 206
Right side of cab
1. Remove hydraulic tank filler cap (1) slowly in
order to relieve any pressure.
2. Wash the filler strainer and the filler cap in a
clean n
onflammable solvent.
3. Use a 126-7914 Oil Drain
Coupling and attach a
1 inch hose. Make sure that enough of the swivel
hose bypasses the track assembly and fills into a
suitable container.
4. Rem
ove oil drain plug (3) which is located under
the ri
ght fender of the machine.
5. Install the swivel hose into the drain plug
opening.
6. Rotate the swivel hose clockwise in order to open
the int
ernal drain valve. Allow the oil to drain into
a suitable container.
7. Rem
ove the swivel hose. The internal drain valve
for the hydraulic tank will close.
8. Cle
an the drain plug and install the drain plug.
Tight
en the drain plug to a torque of 68 7 N·m
(50 5 lb ft).
9. Ch
ange the hydraulic system filter.
Referen
ce: See Oper
ation and Maintenance
Manual, “Hydraulic System Oil Filter - Replace”.
10. Install the filler strainer.
11. Fill the hydraulic oil tank.
Refe
rence: See Oper
ation and Maintenance
Manual, “Lubricant Viscosities and Capacities
(Refill)” for additional information.
12. Inspect
the filler cap gasket. Replace the gasket
if
damage or wear is evident.