Heavy Duty Balanced Opposed Compressors

FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE
Piston and Rod - Disassembly and Reassembly
Disassembly
The Piston and Rod Clamping Fixture shown in Figure 5-11: on page 5-19 will be useful for
the piston and rod disassembly and reassembly operations. This fixture may be purchased
from Ariel.
Part Number
D-0961
Spanner bolts
onto piston nut
FIGURE 5-11: PISTON AND ROD CLAMPING FIXTURE
1. Clamp the piston and rod assembly in the special Clamping Fixture (D-0961),
using the bushing for a 1-1/8” rod size (see Figure 5-11:). Tighten the four 12point
cap screws to prevent the rod from turning. The fixture will properly hold
the piston rod to prevent damage to the parts and promote safety during disassembly
and reassembly. The Clamping Fixture must be securely bolted down to
prevent it from turning with the piston rod. It should be at a convenient height of
approximately three feet or 0.9 meters. Remove the setscrews from the piston
nut. Although the piston nut has been staked to lock the setscrews, they can be
forced out, by turning with an Allen wrench, past the small lip that has been
formed.
2. Remove piston nut using piston nut spanner (see Figure 7-1: on page 7-3).
NOTE: A SMALL AMOUNT OF GAS PRESSURE CAN BUILD UP WITHIN THE PISTON
DURING OPERATION. THIS WILL VENT WHEN THE PISTON NUT IS LOOS-
ENED.
3. After the piston nut has been removed, the piston and collar will slip off the end
of the rod.
11/01 PAGE 5 - 19