Service Manual

325/328 Excavator
Operation and Maintenance Manual 78
HYDRAULIC SYSTEM (CONT’D)
Replacing The Hydraulic Oil
See the SERVICE SCHEDULE for the correct service
interval. (See SERVICE SCHEDULE on Page 59.)
WARNING
Diesel fuel or hydraulic fluid under pressure can
penetrate skin or eyes, causing serious injury or
death. Fluid leaks under pressure may not be visible.
Use a piece of cardboard or wood to find leaks. Do
not use your bare hand. Wear safety goggles. If fluid
enters skin or eyes, get immediate medical attention
from a doctor familiar with this injury.
W-2072-0496
Retract the arm and bucket cylinders, lower the bucket to
the ground. Stop the engine.
Open the tailgate.
Figure PM-35
Remove the drain plug (Item 1) [Figure PM-35].
Drain the fluid into a container.
Recycle or dispose of the fluid in an environmentally safe
manner.
Install the drain plug (Item 1) [Figure PM-35].
Add the correct fluid to the reservoir until it is visible in the
sight gauge.
Figure PM-36
Figure PM-37
Open the bleed valve (Item 1) [Figure PM-37] (early
models) or loosen the plug (Item 1) [Figure PM-37] (later
models) on the hydraulic pump. Close the valve or plug
after a steady stream of hydraulic fluid free of any air
bubbles drains from the valve. Tighten the bleed valve.
DO NOT RUN THE MACHINE WITH THE BLEED
VALVE OR PLUG OPEN.
Run the machine through the hydraulic functions. Stop the
engine. Check the fluid level and add as needed.
P-49433
1
P-49434
1
P-49434A
1