mycom J Series User Manual

2205B0JE-DA-J-N_2014.05.
5 Maintenance and Inspection
Screw Compressor J-series 5.4 Disassembly and Assembly of the Compressor
5-73
5.4.24 Adjustment of End Clearance
1. Rotate the male rotor clockwise several turns.
2. Press the end face of male rotor on a suction side securely.
3. Attach the point of a dial gauge on the suction
cover side end face of the male rotor.
4. Reset the dial gauge scale to 0.
5. Using a torque wrench, tighten the hexagon socket
head cap screws (M8×30/M12×50/M16×65) for
thrust gland diagonally little by little and finally
tighten them to the specified torque.
6. Check if the dial gauge reading falls in the
specified range.
Specified range: 0.04 - 0.06 (170J)
0.06 – 0.08 (220J)
0.10 – 0.14 (280J)
(1) When the end clearance is smaller than the specified value
To deal with this, insert shim material (thrust adjustment liner) of required thickness (difference
in thickness from the specified value) between the thrust bearing alignment spacer 【42】 and
thrust bearing inner race.
* The thrust adjustment liner is not shown in the development view, but available from us. Place
an order together with a model name.
Also, in case of 170 J and the 220 J series, using a highly accurate surface grinding machine
or asking professional service vendors to grind, grind the surface of thrust bearing outer race
spacer【41】 by the difference from the specified value.
This method doesn't apply to the 280 J series which isn't using a thrust bearing outer race
spacer.
After grinding the flat surface, measure the whole circumference of the saucer by using a
micrometer, and check that the thickness is even.
(2) When the end clearance is larger than the specified value
As the end clearance is excessive, remove shim material (thrust adjustment liner) of a
thickness equal to the difference between the measured value and the specified value if the
shim material is used between thrust bearing alignment spacer and thrust bearing inner race.
Or if the shim material is not used between thrust bearing alignment spacer and thrust bearing
inner race, or even if used but insufficient thickness, grind the surface of thrust bearing
alignment spacer【42】 by the difference between the measured value and the specified value
or ask professional service vendors to do so.
After grinding the flat surface, measure the whole circumference of the spacer by using a
micrometer, and check that the thickness is even.
7. Rotate the male rotor counterclockwise several turns.

mycom J Series Specifications

General

Brand	mycom
Model	J Series
Category	Air Compressor
Language	English