SEAT-VALVE SPRING 9M0387 - Caterpillar

Note: Do not use the belt tension charts for belts with tensioners that are spring loaded.
Table 1
Belt Tension Chart    
Size of Belt     Width of Belt     Gauge Reading     Kent-Moore Gauge Numbers    
Belt Tension
"Initial" (1) Belt Tension
"Used" (2) (3)     Number of the Old Gauge     Number of the New Gauge    
3/8     10.72 mm (0.422 inch)    
534 111 N (120 25 lb)    
400 22 N (90 5 lb)     BT-33-97     BT 3397    
1/2    
13.89 mm (0.547 Inch)    
578 111 N (130 25 lb)    
445 44 N (100 10 lb)     BT-33-97     BT 3397    
5V    
15.88 mm (0.626 Inch)    
712 111 N (160 25 lb)    
445 44 N (100 10 lb)     BT-33-72C     BT 3372C    
11/16    
17.48 mm (0.688 Inch)    
712 111 N (160 25 lb)    
445 44 N (100 10 lb)     BT-33-72C     BT 3372C    
3/4    
19.05 mm (0.750 Inch)    
712 111 N (160 25 lb)    
445 44 N (100 10 lb)     BT-33-72C     BT 3372C    
15/16    
23.83 mm (0.938 Inch)    
712 111 N (160 25 lb)    
445 44 N (100 10 lb)     BT-33-77     BT 3372C    
8PK    
27.82 mm (1.095 inch)    
1068 111 N (240 25 lb)    
890 44 N (200 10 lb)     BT-33-109     BT 33109    
6PK    
20.94 mm (0.824 Inch)    
801 111 N (180 25 lb)    
667 44 N (150 10 lb)     BT-33-109     BT 33109    
Measure the tension of the belt that is farthest from the engine.    
( 1 ) Belt tension "Initial" is for a new belt.
( 2 ) Belt tension "Used" is for a belt that has operated for 30 minutes or more of operation at the rated speed.
( 3 ) If a belt falls below the "Used" belt tension, the belt should be tightened again to the high side of the "Used" belt tension.
Table 2
DAYCO Supplied Belts Only    
Size of Belt     Belt Tension
"Initial"     Belt Tension
"Used" (4)    
0.380 (V-Belt)    
623 22 N (140 5 lb)    
445 22 N (100 5 lb)    
0.440 (V-Belt)    
667 22 N (150 5 lb)    
445 22 N (100 5 lb)    
0.500 (V-Belt)    
712 22 N (160 5 lb)    
445 22 N (100 5 lb)    
0.600 (V-Belt)    
779 22 N (175 5 lb)    
445 22 N (100 5 lb)    
0.660