Heavy Duty Balanced Opposed Compressors - Ariel Corporation

FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE
10. Rotate one detuner half 90° around the crankshaft. Hold this half securely, preferably
with a crane, then rotate the second half around the crankshaft 90° in the
opposite direction.
11. Move one or both detuner halves axially along the crankshaft until they exactly
match together and the bolt holes align. Lubricate threads and bolt-head seating
surfaces with lubricating oil or Lubriplate 630, then install the top capscrew(s) to
finger tight.
12. If only one detuner is
required, center it on the
crankshaft spreader section.
If two or more detuners
are required, center
them, in contact with
each other, on the crankshaft
spreader section, as
shown in the Figure.
NOTE: THE TVA REPORT MAY SPECIFY A DIFFERENT LOCATION FOR THE
DETUNER(S).
13. Rotate the crankshaft 180°. Lubricate threads and bolt-head seating surfaces
with lubricating oil or Lubriplate 630, then install the remaining capscrew(s) to
finger tight. Remove lifting eyebolts from detuner halves, if used.
14. Using a sequential pattern from one side of the detuner to the other, tighten
each of the capscrews in 25% increments to the torque value in the Section 1
“Fastener Tightening Values” table or the appropriate value on the Tool Box
Chart "Ariel Bolting Required Tightening Torque" (Ariel part number ER-63, also
available at www.arielcorp.com). Rotate the crankshaft 180° for easy access to
the capscrews as each side is tightened.
15. Proper installation and fastener tightening will provide a gap between the
detuner halves on both sides. Confirm gaps with feeler stock. If there is no gap,
determine and correct the cause prior to starting the compressor.
16. Check to be sure that all tools, eyebolts and other materials have been
removed, then replace crankcase top cover.
Chain Drive System
Description
Detuner(s) Centered in Spreader Section
unless TVA specifies otherwise.
Spreader Section
FIGURE 5-17 DETUNER LOCATION -
TYPICAL
The chain drive system is crankshaft-driven at the auxiliary end of the frame. Two chains run
the lube oil pump and force feed lubricator. Chain tightness is controlled by idler sprockets
attached to the eccentric adjustment caps. The drive chains are constantly lubricated through
a chain oiler fitting. See Figure 5-18 on Page 5-30 for the auxiliary end components and chain
drive system for JGZ and JGU Models.
Replacement of any parts that can change the position of the drive sprocket on the crankshaft
(i.e. crankshaft, drive sprocket, thrust plates), and/or loss of the as built sprocket position
on driven components, can require repositioning the lube oil pump and force feed
lubricator sprockets. Center crankshaft in end play. With a good straight edge, check to see
that sprockets are aligned within 1/32 inch (1mm). Or measure the distance between the
inside face of the auxiliary end cover to the near faces of the drive sprockets on the crank-
7/09 PAGE 5 - 29