Chapter 5 Maintenance and Inspection
UD-series Screw Compressor
5.5 Reassembly
5-60
400*UD Tightening of thrust bearing gland with hexagon socket head cap screw
5.5.8 Bearing Cover
Screw a long safety bolt into the bearing head and press the gasket and the bearing cover, taking
care not to damage the mechanical seal.
Adjust the parallel pin (part number 19) while taking care
to keep it parallel, and press the bearing cover against the bearing head.
Tighten the two hexagon socket head bolts on the diagonal, making sure that the bearing covers
are parallel.
After the whole surface of the bearing cover contacts the bearing head, fix the
remaining hexagon socket head cap screws.
Setting the bearing cover
Setting the bearing cover
5.5.9
Unloader Piston and Unloader Cylinder
a) Inside the unloader cylinder [60] is an unloader piston [64] around which the cap seal [66] and
O-ring [65] are fitted. The unloader piston is assembled to the unloader push rod [67], which
operates the unloader slide valve, with the lock nut [69].
Unloader cylinder is secured to the balance piston cover [22] with two short hexagon head cap
screws 61] and to the suction cover with six log hexagon head cap screws [62].
