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7-22
2. MAIN CONTROL VALVE
Part name
Inspection item
Criteria & measure
Casing
½
Existence of scratch, rusting or corrosion.
½ G
In case of damage in following section, replace
part.
- Sliding sections of casing fore and spool,
especially land sections applied with holded
pressure.
- Seal pocket section where spool is inserted.
- Seal section of port where O-ring contacts.
- Seal section of each relief valve for main,
travel, and port.
- Other damages that may damage normal
functions.
Spool
½
½
½
G
Existence of scratch, gnawing, rusting or
corrosion.
O-ring seal sections at both ends.
G
Insert spool in casing hole, rotate and
reciprocate it.
½
½
½
G
Replacement when its outside sliding section
has scratch (especially on seals-contacting
section).
Replacement when its sliding section has
scratch.
G
Correction or replacement when O-ring is
damaged or when spool does not move
smoothly.
Poppet
½
½
Damage of poppet or spring
Insert poppet into casing and function it.
½
½
G
Correction or replacement when sealing is
incomplete.
G
Normal when it can function lightly without
being caught.
Around spring
½ G
Rusting, corrosion, deformation or breaking of
spring, spring seat, plug or cover.
½
Replacement for significant damage.
Around seal
for spool
½
½
External oil leakage.
G
Rusting, corrosion or deformation of seal
plate.
½
½
Correction or replacement.
Correction or replacement.
Main relief valve,
port relief valve &
negative control
relief valve
½
½
½
½
½
External rusting or damage.
Contacting face of valve seat.
Contacting face of poppet.
Abnormal spring.
O-rings, back up rings and seals.
½
½
½
½
½
Replacement.
Replacement when damaged.
Replacement when damaged.
Replacement.
100
L
replacement in general.
Summary of Contents for HX140L
Page 12: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Page 209: ...4 5 MEMORANDUM...
Page 694: ...8 68 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Page 734: ...8 108 Assemble plug 2 Plug NPT1 16 11 EA 17 21078TM68 21078TM69 21078TM70 21078TM71...
Page 756: ...8 130 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...