Service Repair Manual
320, 320 L, 320 N AND
320 S EXCAVATOR
Model: 320-A EXCAVATOR 4ZJ
Configuration: 320, 320 L, 320 N AND 320 S EXCAVATORS 4ZJ00460-UP (MACHINE) POWERED BY 3116 ENGINE
Disassembly and Assembly
SUPPLEMENT FOR 320S EXCAVATOR MACHINE SYSTEMS
Media Number -SENR6083-01
Publication Date -01/10/2004
Date Updated -24/05/2005
SMCS - 4050-010; 4050-017
Remove & Install Final Drives
a. separate track assemblies
At operating temperature, the hydraulic oil tank is hot and under
pressure. Hot oil can cause burns. To prevent possible personal injury,
release the pressure in the implement hydraulic circuits (boom, stick
and bucket) before any hydraulic lines or components are disconnected
1. Release the pressure in the hydraulic system as follows:
a. Fully retract the rod in the stick cylinder.
b. Adjust the position of the bucket so it will be flat on the ground when the boom is lowered.
c. Lower the boom until the bucket is flat on the ground.
d. Shut off the engine, and put the hydraulic activation control lever in the "Lock" position.
e. Move the control levers for the boom, bucket, stick and swing through their full travel strokes.
This will relieve any pressure that may be present in the pilot system.
f. Slowly loosen the air breather cap on the hydraulic oil tank to release the pressure.
g. Tighten the air breather cap on the hydraulic oil tank.
h. The pressure in the hydraulic system has now been released. Lines and components can now be
2. Remove the access cover assembly from over the rear side of the final drive.
3. Fasten tool (A) and a hoist to final drive (1). Put slight lifting tension on the final drive with the
4. Disconnect hose assemblies (2) and (7) from the travel motor. Disconnect pipes (5) and (6)
from the travel brake valve. Put plugs in the pip