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National Crane
Published 5-27-2018 Control # 039-06
7-11
800D
SIDE SHIMMING OF BOOM SECTIONS
SERVICING THE CONTROL VALVES
Disassembly and Reassembly of Control
Valves to Replace Seals
NOTE: For clarification, we shall call the inlet cover
containing the main relief the left side of the valve
assembly.
1. Before disassembly, it is suggested that each valve
section be marked numerically to avoid incorrect
reassembly.
2. Remove three assembly stud nuts from the end section
using a 9/16 in thin wall 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, three required, with all
assembly studs. No lockwashers! All studs are stress-
proof material and should be replaced only with original
equipment replacement parts.
5. Thoroughly clean O-ring counterbores and ground
surfaces of each section.
6. Replace the four O-rings for crane valve and three O-
rings for hoist valve, two seals per section. Buna-N seals
are standard.
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 assembly
studs, replace stud nuts and tighten evenly to 32 lb-ft
(43 Nm) torque for crane valve and 25 lb-ft (34 Nm)
torque for hoist valve.
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
Valve sections and covers are identified by numbers cast into
the body.
1. Remove bonnet assembly parts from back of valves and
keep in order of disassembly.
2. Remove all parts connected to the spool on the front of
the valve.
NOTE: Do not remove the spool as the seals can be
replaced externally. Prevent spool from turning or
moving by inserting a screw driver through clevis slot,
or running a rod through the pin hole and using a
handle. Do not hold the spool with a wrench. This will
destroy the finish. Always replace all spool seal parts
with parts included in spool seal replacement kit.
3. Remove boot retainer plate, seal retainer plate washers,
back-up washers and spool seals.
4. Thoroughly clean counterbore.
5. Lightly oil new seals. Slide over valve spool and insert in
seal counterbore.
BONNET
ASSEMBLY
CRANEVALVE 10
lb-ft (13,5 Nm)
HOIST VALVE 5
lb-ft (6,8 Nm)
CRANEVALVE 10
lb-ft (13,5 Nm)
HOIST VALVE 5
lb-ft (6,8 Nm)
BACK-UP WASHERS
SPOOL SEAL
SEAL RETAINER PLATE
TYPICAL 2 PLCS
9419
Fo
r
Reference
Only
Содержание National Crane 800D
Страница 1: ...Operator and Service Manual National Crane 800D F o r R e f e r e n c e O n l y ...
Страница 4: ...F o r R e f e r e n c e O n l y ...
Страница 98: ...MAINTENANCE 800D 3 10 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 194: ...SPECIFICATIONS 800D 8 4 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 216: ...INSTALLATION 800D 9 22 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 232: ...CRANE INSTALLATION 800D 10 16 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 252: ...SCHEMATICS 800D 2 Published 5 27 2018 Control 039 06 F o r R e f e r e n c e O n l y ...
Страница 255: ...F o r R e f e r e n c e O n l y ...
Страница 256: ...F o r R e f e r e n c e O n l y ...