DISC 0973587 - Caterpillar

Measuring Crimp Diameter
Quality control of finished crimped hose assemblies is maintained by measuring the crimp diameter. Crimp diameters can be measured using a micrometer, calipers, caliper measurement system, or a Crimputer.For more information on measuring crimp diameters, refer to NEHS0768 General Information for Hose Assembly.
Deburr the outside of the coupling to remove any sharp edges.Note: When correctly crimped, the outside covering on Thermoplastic Hose, 1543 Air Conditioning Hose should slightly protrude (bulge) into the small hole of the coupling. Discard any hose assembly that does not meet this requirement.
Illustration 42 g03571417
Properly Crimped 1543 Air Conditioning Hose Coupling, with Hose Covering Visible through Small Hole
Measure the crimp diameter at the halfway point on the crimped area. Measure four places at the smooth area between ridges. Record and average the four readings. Discard any hose assembly that does not meet crimp specifications.
Illustration 43 g03571436
Measure at the Halfway Point on the Crimped AreaNote: When measuring the crimp diameter, do not take measurements across the ridges of the coupling. To ensure accuracy, each measurement must be taken in the areas between the ridges.
Illustration 44 g03571519
Measure the Crimp Diameter
Discard any hose assembly that does not meet crimp specifications. If crimps meet specifications, clean the inside of the hose using a hose cleaner group.Crimp Diameters
Table 1
Crimp Diameters for 1028 Thermoplastic Hose    
Dash No.     Hose Inside Diameter     Crimp Diameter (1)    
-3     4.76 mm (.188 in)     12.45 mm (.490 in)    
-4     6.35 mm (.250 in)     14.48 mm (.570 in)    
-5     7.94 mm (.313 in)     16.01 mm (.630 in)    
-6     9.53 mm (.375 in)     17.41 mm (.685 in)    
-8     12.70 mm (.500 in)     21.59 mm (.850 in)    
-12     19.05 mm (.750 in)     29.21 mm (1.15 in)    
( 1 ) Tolerance: 0.25 mm (.01 in)
Table 2
Crimp Diameters for 2760 Reduced Diameter Thermoplastic Hose    
Dash No.     Hose Inside Diameter     Crimp Diameter (1)    
-4     6.35 mm (.250 in)     13.08 mm (.515 in)    
-5     7.94 mm (.313 in)     15.75 mm (.620 in)    
-6     9.53 mm (.375 in)     17.53 mm (.690 in)    
-8     12.70 mm (.500 in)     19.81 mm (.780 in)    
( 1 ) Tolerance: 0.13 mm (.005 in)
Table 3
Crimp Diameters for 1543 Air Conditioning Hose    
Dash No.     Hose Inside Diameter     Crimp Diameter (1)    
-6     10.31 mm (.406 in)     13.78 mm (.542 in)    
-8     12.70 mm (.500 in)     16.76 mm (.660 in)    
-10     15.87 mm (.625 in)     19.81 mm (.780 in)    
-12     19.05 mm (.750 in)     29.61 mm (1.16 in)    
-14     22.23 mm (.875 in)     26.55 mm (1.045 in)    
( 1 ) Tolerance: 0.25 mm (.010 in)
Illustration 45 g03571677