Komatsu 82E Series - Trochoid Pump Inspection and Measurement

5-4 82E-5 – 98E-5 SERIES
5. LUBRICATION SYSTEM
5.5 Parts Inspection and Measurement
5.5.1 Trochoid pump inspection and measurement
(1) Outside clearance of outer rotor
Insert a gap gauge between a outer rotor and a
pump body, and measure the clearance.
Outside clearance mm
(2) Side clearance of outer rotor
When measuring a side clearance, put a right-
angle gauge to the pump body, insert a gap
gauge and measure the clearance.
Side clearance mm
(3) Inner rotor and gear boss clearance (3D82AE – 4D88E)
Model Standard Limit
3D82AE – 4D88E 0.12 – 0.21 0.30
4D94LE, (S)4D98E 0.100 – 0.155 0.25
Model Standard Limit
3D82AE – 4D88E 0.02 – 0.07 0.12
4D94LE, (S)4D98E 0.05 – 0.10 0.15
Item Part
Standard
dimension
(mm)
Standard
clearance
(mm)
Standard
clearance
limit (mm)
Inside clearance of
inner rotor
Gear boss diameter 53.05 – 53.15
0.3 – 0.5 0.6
Rotor inner diameter 53.45 – 53.55
Width across flat clear-
ance of inner rotor
Width across flat of gear boss 49.45 – 49.75
0.2 – 0.6 0.7
Width across flat of rotor 49.95 – 50.05