15. HAND PUMP HANDLE.
The hand pump handle (7, figure 4) is mounted on
the hydraulic hand pump (1). When actuated by the
handle, the hydraulic hand pump draws hydraulic
fluid from the reservoir (4) and forces the fluid into
the hydraulic cylinder assembly (3) causing the
upper structure to rise.
16. BY-PASS VALVE.
The by-pass valve (6, figure 4) is a needle-type
valve and is located under the hydraulic hand
pump (1). When the by-pass valve is in the closed
position, it locks the fluid under pressure in the
hydraulic cylinder assembly. Opening the by-pass
valve allows the fluid from the cylinder assembly
to by-pass the hand pump and return to the reser-
voir, causing the upper structure to lower.
17. HYDRAULIC CYLINDER LOCK ASSEMBLY.
The hydraulic cylinder lock (20, figure 1) must be
positioned manually. It must be rotated to lock the
fingers of the hydraulic cylinder barrel lock assem-
bly into the proper slot of the hydraulic cylinder
18. SNAP FASTENER.
The snap fastener (18, figure 1), located on the
rear cross brace, secures the upper structure as-
sembly (4) to the base assembly when the upper
structure assembly is in the fully lowered position.
Figure 3. Immobilizing Jack.