Case 580SR Service Manual page 817

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The compressor drive belt (1) can be tensioned by
rotation of the idler arm (2). Slacken the idler arm
bolt and adjust the arm to a belt deflection of 16 mm.
Once adjusted re-torque the tension arm bolt to 33.9
Nm.
OVERHAUL COMPRESSOR
Before any internal repair is done, drain the oil from
the compressor:
Z Remove the oil plug and drain as much oil as pos-
sible into a suitable container.
Z Remove the caps (if present) from suction and dis-
charge ports.
Z Drain oil from the section and discharge ports into
suitable container while turning the shaft clockwise
only with a socket wrench on the armature retain-
ing nut.
Z Measure and record the amount of oil discharged.
Z Inspect the oil for signs of contamination such as
discoloration of foreign material.
SECTION 50 - CAB HEATING AND AIR CONDITIONING
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