Lull 1044C-54 Series II Service Manual - Manual (Page 116)

Supply, Pressure, and Return Hydraulics
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3. While watching test gauge, press brake pedal numerous times until
pressure gauge reads 0 psi. Remove test gauge from diagnostic port.
4. Thoroughly clean the hydraulic pump to ensure that dirt will not get into
the system/transmission.
5. Tag and slowly loosen the ten (10) hydraulic hoses shown in Fig. 5-22
(Items 1, 2, 3, 7 thru 11, 14 and 16) and the two (2) hydraulic hoses
shown in Fig. 5-24 (Items 1 & 12). Bleed any remaining oil into
appropriate container. Disconnect hoses. Cap fittings and hoses.