E900H User Manual 6: Maintenance
02250203-986 R03
Subject to EAR, ECCN EAR99 and related export control restrictions. 49
6.13.1.1 Pressure reducing regulator
When running with the compressor loaded, adjust the
pressure reducing regulator to maintain 70 psig (4.8 bar)
sign
al to open the inlet valve.
6.13.2 Shaft coupling maintenance
The coupling is a jaw type in shear. If the elastomeric
(rubber) element requires replacement due to wear or
damage, order a replacement element and perform the
following steps:
1. Remove the coupling guard.
2
. Loosen the retaining screw located on the
outer sleeve. Slide the sleeve to one side,
exposing the coupling.
3. Unwrap the coupling element from the cou-
pling jaws.
4. Install the new element by wrapping it
around the jaws, engaging the cogs on the
element into the jaws.
5. Reinstall the outer sleeve and secure by
tightening the two screws to 45 in-lbs
(5 Nm).
6. Reinstall the coupling guard.
6.13.3 Unload pressure setting
1. Start compressor with service valve closed
or slightly open.
2. Observe the pressure at which the contacts
open and machine unloads.
3. Turn the range adjustment screw until
desired unload pressure setting is achieved.
6.13.4 Differential setting
1. Unload compressor and allow receiver pres-
sure to reach its minimum.
2. Open service valve and observe the pres-
sure at which the pressure switch contacts
close and the compressor loads.
3. Turn the differential adjustment screw until
the desired load pressure and differential is
achieved.
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