4. ENGINE
4-3-21
4-3-9 Trochoid Pump
1) Clearance Between Outer Rotor and Pump Body
Insert a thickness gauge between the outer rotor and the
pump body to measure the clearance.
2) Clearance Between Outer Rotor and Inner Rotor
Insert a thickness gauge between the top of the inner
rotor tooth and the top of the outer rotor tooth to mea-
sure the clearance.
3) Distortion Between Pump Body and Inner Rotor,
Outer Rotor
Place a straight edge on the end face of the pump body
and insert a thickness gauge between the straight edge
and the rotors to measure the distortion.
4) Clearance Between Rotor Shaft and Side Cover
Shaft Hole
Measure the rotor shaft outside diameter and the side
cover shaft hole diameter, and calculate the difference
between the hole diameter and the outside diameter.
5) Others
(1) Check for looseness of the engagement of the drive gear and the rotor shaft, and replace the entire assembly if
there is looseness or play.
(2) Push the oil pressure regulating valve piston from the drill hole side to check if the piston returns normally.
Replace the entire assembly if the piston does not return due to the broken spring or any other trouble.
(3) Check that the rotor shaft rotates smoothly when the drive gear is rotated.
Standard
Wear limit
Clearance between
outer rotor and
pump body
Refer to Section "3-2 1) Nominal
and Allowable Values".
Standard
Wear limit
Clearance between
outer rotor and
inner rotor
Refer to Section "3-2 1) Nominal
and Allowable Values".
Standard
Wear limit
Distortion between
the pump body and
the inner and outer
rotors
Refer to Section "3-2 1) Nominal and
Allowable Values".
Standard
Wear limit
Clearance between
rotor shaft and
side cover shaft hole
Refer to Section "3-2 1) Nominal and
Allowable Values".
Outer rotor
Pump body
Thickness gauge
Measuring the clearance between
outer rotor and pump body
(
)
Measuring the clearance between
outer rotor and inner rotor
(
)
Outer rotor
Inner rotor
Thickness gauge
Summary of Contents for ViO12-2A
Page 1: ...SERVICE MANUAL EXCAVATOR ViO12 2A...
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Page 109: ...5 3 1 5 ELECTRIC SYSTEM 5 3 Wiring Diagram...
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Page 117: ...6 HYDRAULIC SYSTEM 6 1 3...
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Page 123: ...6 HYDRAULIC SYSTEM 6 2 1 6 2 Hydraulic Circuit Schematic...
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Page 219: ...6 HYDRAULIC SYSTEM 6 7 8 1 4 3 8 7 12 10 10 15 a b c Loctite 262 0 30Nm 0 45Nm...
Page 348: ...7 ADJUSTMENT AND REPAIR 7 5 31 6 Control Levers Pilot valves Control valve...
Page 349: ...7 ADJUSTMENT AND REPAIR 7 5 32 7 Upperstructure Implement Bucket cylinder Arm cylinder...
Page 351: ...7 ADJUSTMENT AND REPAIR 7 5 34 9 Undercarriage High speed travel solenoid valve...
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Page 360: ...CHAPTER 8 PERIODIC INSPECTION AND SERVICING 8 1 List of Periodic Inspection and Servicing 8 1...
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Page 364: ...CHAPTER 9 FUEL LUBE OIL AND GREASE RECOMMENDED 9 Fuel Lube Oil and Grease Recommended 9 1...
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Page 406: ...CHAPTER 11 REFERENCE DATA 11 1 Specifications for Attachment 11 1...
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