4. T OWING T RAILER
4.1 LIFT AXLE(S) Your trailer can be equipped with one or more lift axles and may be equipped with a regulator valve. With trailer loaded, the axle(s) are lowered to help carry and distribute the load forces on the trailer. Turn the valve (A) to set the air pressure to the desired level. See Figure 4-1.
Figure 4-1 – Lift Axle Regulator Valve Use the correct chart below for the axle(s) on your trailer to set the air pressure.
AAL,AAT & AANT C-20901,C-23611, C-23612, C-23721, C-23748 SUSPENSION LOAD SCALE INTRAAX 250 GAUGE PRESSURE LOAD PER AXLE 24 PSI 165 KPA 7000 LB 3175 KG 32 PSI 221 KPA 9000 LB 4082 KG 40 PSI 276 KPA 11000 LB 4990 KG 48 PSI 331 KPA 13000 LB 5897 KG 56 PSI 386 KPA 15000 LB 6804 KG 65 PSI 448 KPA 17000 LB 7711 KG 72 PSI 496 KPA 19000 LB 8618 KG 80 PSI 552 KPA 21000 LB 9526 KG 88 PSI 607 KPA 23000 LB 10433 KG 96 PSI 662 KPA 25000 LB 11340 KG 5-5 MAC TRAILER MANUFACTURING INC.
AAL,AAT C-25871,C-23611, C-25872 & C- 25873 SUSPENSION LOAD SCALE INTRAAX 300 GAUGE PRESSURE LOAD PER AXLE 30 PSI 207 KPA 10000 LB 4536 KG 37 PSI 255 KPA 12000 LB 5443 KG 44 PSI 303 KPA 14000 LB 6350 KG 51 PSI 352 KPA 16000 LB 7258 KG 58 PSI 400 KPA 18000 LB 8165 KG 64 PSI 441 KPA 20000 LB 9072 KG 71 PSI 490 KPA 22000 LB 9979 KG 78 PSI 538 KPA 24000 LB 10886 KG 85 PSI 586 KPA 26000 LB 11794 KG 92 PSI 634 KPA 28000 LB 12701 KG 99 PSI 683 KPA 30000 LB 13608 KG 5-5 MAC TRAILER MANUFACTURING INC.
With the trailer empty, raise the axle(s) off the surface by relieving the air pressure on the lift axles.
^ WARNING
Collision hazard. An empty trailer with the lift axle(s) in the down position can be unstable while towing, which can result in loss of control. Raise the lift axle(s) off the surface on an empty trailer before towing.
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