SERVICE 1400H OPERATOR AND SERVICE MANUAL
5-44 Published 10-30-2014 Control # 040-09
SERVICING THE MAIN CONTROL VALVE
Disassembly And Reassembly Of Control
Valves To Replace Seals
1. Before disassembly, it is suggested that each valve
section be marked numerically to avoid incorrect
stacking when reassembled.
2. Remove four assembly stud nuts from the end section
with a 17 mm open end wrench or socket.
3. Remove valve sections by sliding from assembly studs.
4. If valve sections are to be added or removed, use the
proper length assembly stud.
Note: Use assembly nuts and washers with all
assembly studs. No lock washers! All studs are stress-
proof material and should be replaced only with original
equipment replacement parts.
5. Thoroughly clean O-ring counter bores.
6.
Replace the nine O-rings in between each section.
O-rings are metric (3 pieces 17,86 x 2,62 mm, 2 pieces
12,37 x 2,62 mm, 4 pieces 5,28 x 1,78 mm).
7. Replace valve sections on assembly studs in the same
order in which they were removed.
Note: Use care in replacing valve sections to avoid
dislodging O-rings from counterbores.
8.
When all valve sections are positioned on the assembly
studs, replace stud nuts and tighten evenly in two steps.
Initially tighten all studs to 11 lb-ft (15 Nm), and then
tighten all studs to 20 lb-ft (27 Nm).
Note: If stud nuts are not tightened to the proper
torque, valve spools may bind or stick, or cause section
seals to extrude.
Replacing Spool Seals
1. Remove both capscrews and bonnet from spring end of
spool.
2. Carefully remove the compressed spring package and
spool (one side only).
3. Remove both capscrews from bracket on linkage end of
spool seal counterbores.
4. Remove spool seals and thoroughly clean spool seal
counter bores.
5. Pull seal retainer cup out of spring end of spool.
6. Remove O-rings, clean cup, and install new O-rings.
7. Lightly oil new spool seals and install in counterbores.
8. Reinstall all components in the same order as they were
removed.
9. Torque spring spacing screw and capscrews to 50 lb-in
(6 Nm).
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