TM 5-2420-232-10
0003
HYDRAULIC SYSTEM
0003
1.
Hydraulic Reservoir - contains the hydraulic oil used by the hydraulic system.
2.
Hydraulic Pumps - provide hydraulic pressure to operate the hydraulic circuits. There are three hydraulic pumps. The
first pump (P1) provides the hydraulic power for all the machine s main hydraulic functions, i.e., loader and excavator
functions along with all their associated auxiliaries (hammer, auger, fork tilt, and slide). The second pump (P2) provides
the hydraulic power for the steering, including rear steering, the suspension, hose reel, 4-wheel drive disconnect, and the
parking brake. The third pump is driven by an electric motor; its function is to provide enough hydraulic power to be able
to stow the backhoe, loader, and stabilizers should the machine suffer an engine failure. The third pump also provides
emergency steer.
Front Bucket Crowd Cylinder (1) - used to rollback or dump the bucket.
3.
4.
Dipper Cylinder (2) - used to raise or lower the dipper.
5.
Backhoe Bucket Cylinder (3) - used to rotate the bucket.
6.
Boom Cylinder (4) - used to raise or lower the boom.
7.
Slew Cylinder (5) - used to move backhoe laterally.
8.
Stabilizer Cylinders (6) - used to raise or lower the stabilizers.
9.
Loader Arm Cylinders (7) - used to raise or lower the loader arms for loading operations.
10. Clamshell Bucket Cylinders (8) - used to open or close the clamshell bucket.
Figure 6. Hydraulic System
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