JLG Lull 1044C-54 II Series Service Manual page 114

Supply, Pressure, and Return Hydraulics
Problem
4. Loss of fluid
5-32
Probable Cause
C. Disconnected or broken pump
drive
A. Ruptured hydraulic lines
B. Loose fittings
C. Leaking gaskets or seals in
pump or circuit
Solution
Inspect and repair or replace.
1. Check all external connections, tubing, and
hoses. Tighten connections and replace any
ruptured tubes or hoses.
2. Observe mating sections of pump for leaks.
3. Replace seals or gaskets if possible.
31200079