TM 5-3805-294-10
0003
Hydraulic System
10
11
14
13
15
16
9
12
7
8
17
HYEX01512
6
Figure 2. Hydraulic System Components.
Table 2. Hydraulic System Components.
6
Main Pumps
The HYEX has two main hydraulic pumps that supply hydraulic oil for all
functions including boom, arm, bucket, swing, and travel.
7
Pilot Pump
The pilot pump is a small gear pump that keeps oil moving through the pilot
system. It also provides the pressure to move the spools in the main hydraulic
valve and to release the spring-applied hydraulically-released swing and park
brakes.
8
The hydraulic reservoir is pressurized ensuring that hydraulic oil is always
supplied to the pumps.
9
Main Control Valve
The control valve consists of two monoblock valves referred to as the left control
valve and right control valve. There is a spool in each valve to control the boom,
arm, and travel functions. All other functions are supplied by a single spool in
one or the other of the valves. All spools are moved by pilot oil. Each valve
section controls the flow rate and direction for its hydraulic circuit.