This article focuses on the operation of the Cat 325F L excavator without boom lowering
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AWARNING :
Be sure no one is under or near the work tools be-fore manually lowering the boom.Keep all per-sonnel away from the boom drop area when lowering the boom with the engine stopped in or-der to avoid possible personal injury.
When you must manually lower the boom due to engine shutdown, use the following procedure.
Notnote:
Keep all personnel away from the boom when
you are lowering the boom.
Relieve the pressure in the hydraulic system before
manually lowering the boom. Move the hydraulic
lockout lever to the UNLOCKED position. Move the
travel levers/pedals forward and backward to relieve
the pressure.
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AWARNING
Pressurized system!
The hydraulic tank contains hot oil under pres-
sure. To prevent burns from the sudden release of hot oil, relieve the tank pressure with the en-
gine off by slowly turning the cap approximately
1/8 of a turn untii the cap reaches the secondary stop.
1. Release the pressure that may be present in the return hydraulic circuit with the following procedure. Refer to llustration 205 for filler cap positions.
a. Turn the filler cap counterclockwise, with no downward force applied, and move the arrow from position(A) to position(B).
b. Release the pressure for a minimum of 45
seconds by moving the arrow from position(B)
to position(C).
c. Push the center of the filler cap down. Without tilting the filler cap, move the arrow from position(C) to position(D).
d. The hydraulic tank pressure is relieved. The filler cap can now be removed if needed.
e. Tighten the filler cap on the hydraulic tank to position(A).
2. After the pressure is relieved, tighten the filler cap.
3. Open the engine hood. Loosen clamp (3) and
disconnect hose (2) from the radiator.
4. Remove cover (4), bolts(5) and washers (6).
5. Put the other end of hose into a suitable container.
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6. Slowly loosen screw (4) by a maximum of 1/2 turn.
Loosening screw (4) allows the hydraulic oil in the
boom circuit to drain into the container. The boom
will now start to lower.
Note: Refer to Operation and Maintenance Manual,
“General Hazard Information” for information on
containing fluid spillage.
7. Make sure that the work tool has lowered all the
way to the ground.
8. Connect hose (2) to the original position on the
hydraulic tank and install the fill/vent plug securely.
9. Close the engine hood.
After completion of the manual boom lowering, make
necessary repairs before you operate the machine
again.
