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1 1 Nov 01/04 1 1 1CES 1 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-23-11-991-020 Fig. 232 20-23-11-991-023 Fig. 233 20-23-11-991-024 Fig. 234 20-23-11-991-025 Fig. 235 20-23-11-991-026 Fig. 236 20-23-11-991-027 Fig. 237 20-23-11-991-028 Fig. 238
3. Job Set-up
__________
Subtask 20-23-11-917-059
A. General
(1) This approved repair procedure permits to repair hydraulic tubes in 21-6-9 corrosion-resistant steel or 6061-T6 aluminum alloy.
NOTE : This repair procedure uses a tube-expansion swaging method
____ with an elastomeric expander. It is not applicable to titanium-alloy tubes.
(2)
The use of HARRISON sleeve and union permits to make a separable connection between two tubes or between a tube and a system component. (Ref. Fig. 223/TASK 20-23-11-991-013, 224/TASK 20-23-11-991-014)
(3)
To repair a tube with HARRISON sleeve and union, you must: (Ref. Fig. 225/TASK 20-23-11-991-015)
-cut the tube and remove the damaged section,
-square and deburr the ends of the tubes,
-clean the tubes,
-install the sleeve nut, the sleeve and the union on the tubes,
-swage the tubes into the sleeve and the union,
-connect the ends of the tubes with the sleeve, the nut and the union.
NOTE : You must remove the tube to swage it.
____
(4) You must use the applicable HARRISON elastomeric swaging tools to swage the tube.
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Sleeves and Unions Figure 223/TASK 20-23-11-991-013
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Sleeve and Union Figure 224/TASK 20-23-11-991-014
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Repair Set-Up Figure 225/TASK 20-23-11-991-015
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4. Procedure
_________
Subtask 20-23-11-917-060
A. Preparation of the Tube
(1) Cut the tube and remove the damaged section:
- observe the dimension A between the two tubes,
(Ref. Fig. 225/TASK 20-23-11-991-015)
-make sure that the length of the straight section of the tube immediately after the bent section is the minimum necessary for the swaging operation. (Ref. Fig. 226/TASK 20-23-11-991-021)
NOTE : If the damaged section is too large or too near a bend, you
____ can replace the damaged section by another tube. In this case, you must use two HARRISON fittings.
(2)
Carefully square, deburr and chamfer the ends of the tubes, internally and externally. (Ref. Fig. 227/TASK 20-23-11-991-022)
(3)
Clean the tube with CLEANING AGENTS (Material No. 11-003) and blow air through the tube to remove all swarf and impurities.
Subtask 20-23-11-917-061
B. Preparation of the Swage Tools
NOTE : You can use the manual or the automatic power equipment when you
____ swage. Make sure that each pressure gage used in this procedure is calibrated. If necessary, use a master gage to calibrate the pressure gage. Mark the date of calibration on the gage.
NOTE : Replace the tool components as soon as they show signs of wear.
____
(1) Determine the components of the internal tools to swage the tubes on the sleeve and the union:
-
for corrosion-resistant steel tubes, use the applicable drawbar, expander, split back-up washers, tapered back-up ring and thrust bush, (Ref. Fig. 228/TASK 20-23-11-991-016, 229/TASK 20-23-11-991-017)
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