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4-85
4
CONTROL VALVE
DISASSEMBLY AND ASSEMBLY
Inspection and adjustment
Checking the parts
Parts
Criteria
Action
Housing, valve body
• Scratches, rust or corrosion on the parts sliding against the
spool
• Scratches, rust or corrosion on the seal pocket part that
the spool enters
• Scratches, rust or corrosion on the seal part on the port
that is in contact with the O-ring
• Scratches, rust or corrosion on the seal part of the relief
valve, etc.
• Other damage considered to impair normal functions
• Replace
• Replace
• Replace
• Replace
• Replace
Spool
• Scratches on the sliding surface of outer circumference, on
which the fingernails get caught
• Scratches on parts that slide against the seals at both
ends
• Spool does not move smoothly
• Replace
• Replace
• Repair or replace
Load check valve
• Imperfect sealing due to damage to the valve or spring.
• Operates smoothly when inserted and operated in the
housing
• Repair or replace
• Normal
Around the springs
• Rust, corrosion, deformation, breakage or other notable
damage to the spring, holder or cover
• Replace
Around the spool seal
• Oil leakage to the outside
• Rust, corrosion or deformation of the seal holder
• Repair or replace
• Repair or replace
Main relief valve, port re-
lief valve, anti-cavitation
valve
• External rust, damage
• Damage to valve seat contact surface
• Damage to poppet contact surface
• Abnormality in the spring
• O-rings, backup rings, seals
• Replace
• Replace
• Replace
• Replace
• Replace as a rule
Adjusting the main relief valve pressure
“2. Service data, Performance criteria”
Summary of Contents for TB 250
Page 1: ......
Page 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Page 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Page 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Page 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Page 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Page 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Page 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Page 49: ......
Page 59: ...2 46 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 60: ...2 47 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 61: ...2 48 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
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Page 92: ...3 11 3 CONTROL VALVE FUNCTION...
Page 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Page 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...