4-17. HYDRAULIC SYSTEM CHECK AND FILL (CONT)
To fill hydraulic tank, level semitrailer as follows:
a. Park tractor/semitrailer on level ground with no side slopes (para. 2-24).
b. Check platform height (para. 2-19). Platform should be at normal road height of 43 inches (109 cm) and
gooseneck should be approximately 63 inches (160 cm).
If the fluid level is more than 1 inch (2.5 cm) below the bottom of the FULL mark,
then fluid must be added before operating the APU or damage to equipment may
If more than 1 inch (2.5 cm) of fluid must be added, check the entire hydraulic
system for leaks, and service as required.
If fluid level is below FULL mark on hydraulic tank, add hydraulic fluid to tank as follows:
a. Unhook latch (1) on gooseneck and raise top step (2) to gain access to top of hydraulic tank (3).
b. Wipe dirt from around hydraulic tank breather cap (4) and around top of hydraulic tank (3).
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