Hydraulic system checkout, Group 05 – John Deere 318 User Manual
BEFORE YOU START
Always begin with this group to identify a failure in
the hydraulic system. The step-by-step procedures
will provide you with a quick check of the system. No
special tools are required to perform these checks. If
a failure is indicated, you will be referred to a more
detailed check, adjustment, or test.
Always start with the first step and follow the
sequence from left to right. Read each step
completely before performing the check.
This procedure is designed as a quick check of the
system. While performing the check, concentrate only
on the check you are performing and disregard
signals from unrelated components.
NOTE: The 316 has manual steering (gearbox),
single-spool control valve and rockshaft
The 318 has power steering, steering cylinder,
two-spool control valve, rockshaft cylinder and
The 420 has power steering, steering cylinder,
three-spool control valve, rockshaft cylinder
and oil cooler.
For further information, refer to the overall
hydraulic schematics in Group 10.
SYSTEM OIL LEAK
Check hydraulic oil
level, condition and
Inspect control valve,
cylinders, lines, hoses
and fittings for external
hydraulic oil leakage.
NOTE: 318 Shown
replace, then GO TO
Hydraulic System Checkout
316, 318 & 420 Lawn and Garden Tractors