Heavy Duty Balanced Opposed Compressors - Ariel Corporation

For Models: JGH:E:K:T Section 4 Part Replacement
Wrench flats on the puller-bolts and recessed Allen sockets in the dowel drive pins facilitate
removal and installation.
CAUTION: The A-9047 tool for JGH:E:K:T:C:D machines uses interchangeable base
plates to adapt to different piston o.d.’s and nut sizes. Verify the plate selected will not
permit the piston to be drawn into the end of the tool when tensioned.
CAUTION: The A-9047 tool is equipped with an integral safety collar to ensure the
puller-bolt stem remains captive if the puller-bolt fails. Older A-6774 and A-6799 tools
were equipped with a safety nut on the lower portion of the puller-bolt stem. Verify this
safety nut is re-installed when the puller-bolt stems are re-installed in the tool. Replacement
puller-bolt stems for A-6774 and A-6799 are of the A-9047 integral design.
Position torque tool with the two dowels inserted into the piston nut. Tighten puller head until
torque tool is completely tight against the piston rod assembly, then back off 1/4 turn.
NOTE: The puller head comes with barring holes to insert a 3/8" (9.5 mm) rod to help
tighten or loosen the puller-bolt, if necessary.
3. Apply hydraulic pressure to the torque tool to stretch piston rod (see Table 4-2). Use clean
hydraulic fluid in pump/tool system.
CAUTION: Do not overpressure torque tool; it can cause tool failure and/or excessive
piston rod pre-load. Excessive pre-load can cause piston rod failure, which may result
in personal injury.
CAUTION: Install hydraulic puller stud into piston rod a minimum of eight turns to prevent
piston rod to puller bolt thread failure. Such failures can result in personal injury.
Configure tool properly.
4. Loosen piston rod nut by turning the hex pinion drive counterclockwise with a socket wrench.
Release hydraulic pressure, remove torque tool, and then remove the piston nut.
Piston & Rod Reassembly with Hydraulic Tool
1. Perform steps 1 through 4 in “Manual Piston and Rod Reassembly” on page 4-10.
2. Perform steps 7 through 9 in “Manual Piston and Rod Reassembly” on page 4-10.
3. Mark a line across piston and nut prior to torquing to ensure the nut turns. Verify the threaded
hole in the rod is clean and oiled. Position the torque tool with the two dowels placed into the piston
rod nut. Tighten puller-bolt head, until torque tool is completely tight against the piston rod
assembly, then back off 1/4 turn.
NOTE: The puller head comes with barring holes to insert a rod to help tighten or loosen
the puller, if necessary.
4. Apply hydraulic pressure to torque
tool to stretch the piston rod (see
Table 4-2). Do not overpressure (see
caution above). To tighten piston rod
nut, use a calibrated torque wrench to
torque the hex pinion drive to the
value shown in Table 4-2.
5. Release hydraulic pressure. Reapply
hydraulic pressure, loosen piston nut
without disassembling, and then retighten
to the recommended torque.
This double-torquing ensures piston assembly integrity.
TABLE 4-2 Piston Nut Hydraulic Pressures & Torques
Rod Size,
inch (mm)
Compressor
Model
Hydraulic
Pressure 1
psig (kPa)
Pinion Drive
Torque
lb-ft (N⋅m)
2 (50.8) JGH:E:K:T 3500 (24130) 50 (68)
2-1/2 (63.5) JGC:D 5400 (37230) 100 (136)
2.875 JGZ:U, KBZ:U 8700 (59980) 30 (41)
1. Periodically calibrate hydraulic pressure gauges for the required
pressure. Use optional Ariel hydraulic hand pump kit.
6. Release hydraulic pressure and remove torque tool. Inspect the piston rod at the end of the pis-
3/11 PAGE 4-13