Ariel JGJ Series, Technical Manual

Page: 95 / 141

F
OR
M
ODELS
: JGW, JGR
AND
JGJ S
ECTION
5 - M
AINTENANCE
1/01 PAGE 5 - 23
under the piston as the piston is moved throughout its stroke. Re-measure vertical run out
and compare to acceptable limits in the table above. The horizontal readings, taken without
the use of feelers are to be used for acceptance. Copy Table 5-5 and record calculations
and readings.
If readings are not within acceptable limits after replacing worn parts and correcting any pip-
ing misalignment, the piston rod assembly should be replaced.
Piston Rings
All JGW, JGR and JGJ cylinders use one-piece angle cut filled Teflon piston rings, excepting
tandem cylinders which use stepped seal-joint piston rings and very small cylinders which
use two-piece rings. Seal-joint rings are available for double acting cylinders. Refer to Figure
5-13:.
Seal-joint piston rings are directional and must be installed properly.
To utilize the seal-joint rings in double acting cylinders, in place of angle cut rings, contact
Ariel for new part numbers.
T
ABLE
5-5: F
EELER
T
HICKNESS TO
C
ORRECT FOR
P
ISTON
W
EIGHT
LINE THROW NUMBER: 1 2 3 4 5 6
1 Top Feeler Clearance
2
Line 1 (
)
2)
3
JGJ
Line 2 - 0.003”
(-0.08 mm)
- 0.003”
(-0.08 mm)
- 0.003”
(-0.08 mm)
- 0.003”
(-0.08 mm)
- 0.003”
(-0.08 mm)
- 0.003”
(-0.08 mm)
- 0.003”
(-0.08 mm)
4
JGW
&
JGR
Line 2 - 0.004”
(-0.10 mm)
- 0.004”
(-0.10 mm)
- 0.004”
(-0.10 mm)
- 0.004”
(-0.10 mm)
- 0.004”
(-0.10 mm)
- 0.004”
(-0.10 mm)
- 0.004”
(-0.10 mm)
4 Bottom Feeler
Thickness
5 Vertical~Piston @ CE 0 0 0 0 0 0
6 Vertical~Piston @ HE
F
IGURE
5-13: S
EAL
-J
OINT
R
INGS
Stamped Side
Toward Pressure