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CYLINDERS
DISASSEMBLY AND ASSEMBLY
Inspection after assembly
No load operation test
1. Place the cylinder in a horizontal position with no load.
2. Apply gentle pressure alternately to the ports at both
ends, operating the piston rod 5 or 6 times.
3. Make sure there is no abnormality in the operating con-
dition.
Leak test
External leak
1. Apply test pressure for 3 minutes each to the retraction
side and the extension side.
2. Make sure there are no abnormalities such as external
leakage or permanent deformation, etc. in the rod seal,
the rod cover mount, or in any welded portion.
Internal leak
1. Disconnect the extension side hose.
2. Apply test pressure to the retraction side for 3 min-
utes.
3. Measure the amount of oil that has leaked from the
extension side.
• The amount of leakage should be 1 mL/3 min or
less.
Bleeding air from the hydraulic cylinder
Bleed the air out of the cylinder when the cylinder is re-
moved or when the hydraulic piping, etc. is disconnected.
1. Start the engine and let it idle for approximately 5 min-
utes.
2. With the engine running at slow speed, extend and re-
tract the cylinder 4 or 5 times.
• Move the piston rod to a position 100 mm before
the end of the stroke, being careful not to relieve
air.
3. With the engine at top speed, repeat the operation in
(2), then with the engine running at slow speed, move
the piston rod to the stroke end to relieve air.
4LAA38Z
4LAA39Z
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...
Page 62: ...2 49 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 63: ...2 50 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
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Page 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
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Page 81: ...2 68 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
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...