User Manual

11. Remove steering unit from bottom of machine.
12. Make repairs as necessary. (See procedure in this
group.)
13. Installation is done in the revese order of removal.
• Install steering unit with marks made during removal or
with alignment grooves in port manifold and cover, facing
toward engine.
• Tighten steering wheel-to-shaft nut to 15 N·m (133
lb-in.).
• Bleed hydraulic system. (See procedure in Section 270,
Group 20.)
M31840 -UN-28JUL89
DISASSEMBLE AND INSPECT STEERING
VALVE AND COLUMN
NOTE: Machines may be equipped with a four or
five-port steering valve. The four-port and early
five-port have a plug, O-ring and check ball in
the side of the port cover. The later five-port has
a check ball in the center of the port cover
(internal) and no external plug or O-ring.
IMPORTANT: Use DFMX1 Steering Valve Fixture
when servicing control valve. Holding
control valve in a vise can damage
valve.
1. Install DFMX1 Steering Valve Fixture (A) in a vise.
(See Section 299 for instructions to make fixture.)
2. Install steering valve, with steering column down, in
fixture. Fasten valve to fixture using four 5/16-24 UNF
nuts.
Early Five-Port Shown
3. Check position of alignment grooves (B) to aid in
assembly.
M43839 -UN-06MAR95
MX,15906006,3 -19-10MAR95
MX,15906006,4 -19-10MAR95
Steering—318 and 420/Steering Valve
TM1590 (17MAY95) 60-06-3 316, 318 & 420 Lawn and Garden Tractors
020895
60
06
3