John Deere 318 - Manual (Page 425)

ABOUT THIS GROUP
The step-by-step procedures in this group provide you
with the detailed diagnostic information you will need
to perform a test. Basic diagnostic equipment is used.
It is assumed that you are familiar with the machine
and its hydraulic system components. If you need
additional information, read the theory of operation in
Group 15 or refer to the overall hydraulic schematics
in Group 10.
Engine rpm and temperature are critical in most
hydraulic tests. Be sure to follow test specifications
carefully.
Always start with the first step and follow the
sequence from left to right. Read each step
completely before performing the test.
Upon completing a test or adjustment, check to see
whether the problem is corrected.
NOTE: The 316 has manual steering (gearbox),
single-spool control valve and rockshaft
cylinder.
The 318 has power steering, steering cylinder,
two-spool control valve, rockshaft cylinder and
oil cooler.
The 420 has power steering, steering cylinder,
three-spool control valve, rockshaft cylinder
and oil cooler.
MX,159027020,1 -19-24APR95
Group 20
Diagnosis, Tests and Adjustments
TM1590 (17MAY95)
270-20-1
316, 318 & 420 Lawn and Garden Tractors
020895
270
20
1