John Deere 318 User Manual
DISASSEMBLE, INSPECT AND ASSEMBLE HYDRAULIC CONTROL VALVE—TWO-SPOOL
A—Check Valve Plug (2
F—Float Detent Spool
B—O-Ring (2 used)
H—O-Ring (2 used)
N—Ball (2 used)
C—Spring (2 used)
I—Bushing (2 used)
D—Poppet (2 used)
J—Washer (2 used)
W—Washer (as required)
NOTE: There are five versions of this valve.
Disassembly and assembly procedures may
IMPORTANT: Spools and body are matched and
must be replaced as a unit. Spools
must be installed into the same
bores from which they were
removed for proper operation of
Always use new O-rings. Damaged
or used parts will leak.
NOTE: Note location and position of fittings and
linkages to aid in assembly.
Lubricate all O-rings with petroleum jelly
Inspect all parts for wear or damage. Replace as
• Apply clean John Deere Low Viscosity HY-GARD
oil on all internal parts during assembly.
• Apply MPG-2
Multi-Purpose Polymer Grease on
springs (K and T) and inside of caps (O and Q).
• Tighten caps (O and Q) to 31 N·m (23 lb-ft).
Hydraulic Control Valve/Disassemble, Inspect and Assemble
316, 318 & 420 Lawn and Garden Tractors