MAN-2V3B-4.1V REV (D)
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CHAPTER 7 CORRECTIVE MAINTENANCE – MECHANICAL SYSTEMS
INTRODUCTION:
This chapter presents instructions for adjustments and repairs to the
compressor pump and its accessory items (non-electrical). Scheduled maintenance items are covered in
Chapter 5. Where special tools are required, they are called out in the applicable paragraph. This
chapter is divided into two sections: Section I, Adjustments and Alignments, and Section II, Repair.
WARNING
The compressor may start at any time when in automatic mode. Before attempting any
repairs or adjustments de-energize the machine by disconnecting power to the control
box, vent pressure downstream of the unit and allow the discharge piping to cool.
SECTION I – EXTERNAL ADJUSTMENTS AND ALIGNMENTS
7.1
ALIGNMENT OF DRIVE PULLEYS:
Following any repair which requires removal of the
motor sheave or compressor flywheel, it may be necessary to realign the pulleys.
The pulleys are keyed to the shaft and locked in place with a tapered bushing. The pulleys have a hub
that can be separated by removing the three bolts and using them as jacking devices by inserting into the
threaded holes in the hub and tightening sequentially until the pulley breaks free. When loose, the
pulley and hub can be slid back and forth on the shaft to achieve alignment. To align, use a straight
edge across the outside faces of the pulleys. The gap between the straight edge and flywheel or pulley
should not exceed 1/16" (4 CM).
Torque the bolts per specifications. Check alignment and repeat if necessary. Replace belt guard.
7.2 TIGHTENING
V-BELTS:
To replace belts, loosen the motor (and beltguard if necessary) and roll the belts off the flywheel and
drive sheave, one groove at a time. Install new belts via reverse method.
To obtain the proper tension on the V-belts, use the following procedure:
a.
Loosen the motor tie-down bolts at least three turns.
b.
Move the motor outward until the desired belt tension is achieved. Correct belt tension
allows one quarter inch deflection with 8-10 lb. force applied per belt at mid-span.
c.
Tighten motor tie-down bolts and replace belt guard.
d.
Inspect and retighten new belts as required after 24-48 hours of operation.
Summary of Contents for RIX 2V3B-4.1V Series
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