3.13 Emergency measures against sudden failure of machine

SAFETY BLOCK

SAFETY BLOCK

PLUG

3.13EMERGENCY MEASURES AGAINST

SUDDEN FAILURE OF MACHINE

A. RELEASING LOCK FOR TRAVEL MOTOR

While travel motors are at a standstill, they are hydraulically locked by the counter balance valve, and also mechanically locked by the brake system. When the machine becomes unable to travel due to failure on the travel motors, etc., it is possible to temporarily move the machine by means of releasing lock for the travel motor with removing the spool in the counter balance valve of the travel motor.

CAUTION

When di/re-assembling the travel motor, pay special attention not to allow invasion of foreign particles and dust into the travel motor.

1.Remove the shoes in accordance with

“REPLACEMENT OF RUBBER CRAWLER

SHOE”. 2.Apply safety blocks under the lower frames of left and right (travel motor side), and get down the machine which has been lifted up, then stop the engine. 3.Remove the travel motor cover (1) on the lower frame with loosening three capscrews (2). 4.Provide a container to receive draining oil under the travel motor, then disconnect the hoses. Since the draining oil comes out from the hoses and oil, receive it in the container.

Put a stopper plug to all openings on the hoses.

NOTE: Toavoid erroneous connection of hoses, put a mark, such as the port name, on each hose at their disconnecting.

5.Remove the socket capscrews (3) to remove the travel motor from the lower (crawler) frame. Gradually loosen the capscrews paying attention not to drop off the travel motor. 8-Socket capscrew (3): M10x20 6.Remove the plug (4).

Plug (4): 27 mm of hex. size.

CONTAINER

7.Remove the spool (5). Be careful not to damage the spool during removal. Place spool (5) and loose parts (6) and (7) in a clean container with clean oil to protect them from rust and contamination. 8.Install plugs (4) to prevent contamination.

9.Remove 7-socket capscrew (12), and separate the bodies (10) and (11) from assembly. •Make sure to contain oil spillage and dispose of all hazardous waste in accordance with local government regulations. 10.Remove 10-spring (13) for parking brake. 11.Temporarily reassemble bodies (10) and (11) in without springs (13). 12.Install the travel motor to the lower (crawler) frame and reinstall hydraulic lines. 13.Repeat steps 3 through 12 on the opposite track side to remove the other travel motor. 14.Install track chains in accordance with

“INSTALLATION OF RUBBER CRAWLER

SHOE” in the Section “MAINTENANCE”, and move the machine to a safe place to proceed with repairs.

By removing the spools and springs, the travel motors are released from locked condition.

Move the machine to a safe place.

NOTE: After all repairs are made, reinstall the counter balance spools and brake springs on both travel motors. Make sure hydraulic oil level is to specifications. Refer to “MAINTENANCE” section for proper oil and capacities.

CAUTION

Never allow a hydraulic line or component to become contaminated. This could cause severe system damage. Contact your dealer to obtain the proper caps and plugs to be used on this machine.

B. LOWERING BUCKET

WARNING

This procedure is to be used only as an emergency to lower the position of the bucket. Extreme caution should be excersized since the weight of the bucket will tend to move the bucket abruptly when the lines are disconnected. Make sure to block the attachments to avoid sudden changes in their position. Slowly remove hydraulic lines until oil pressure is completely released. Then control the bucket movement by slowly removing the block.

Tolower the bucket position, proceed as follows: When the bucket is in digging position (A) (bucket cylinder completely extended), disconnect hose (H) side. Conversely, when the bucket is in dump position (B) (bucket cylinder completely retracted), disconnect the hose (R) side.

CAUTION

Clean up all spilled oil. Dispose of all hazardous waste in accordance with local government environmental regulations.

CAUTION

Never allow a hydraulic line or component to become contaminated. This could cause severe system damage. Contact your Dealer to obtain the proper caps and plugs to be used on this machine.

F15615

C. LOWERING ARM & BOOM

WARNING

•This procedure is to be used only as an emergency to lower the position of attachment. Extreme caution should be excersized since the weight of the attachments will tend to drop them abruptly when the lines are disconnected. •Make sure to block the attachments to avoid sudden changes in their position. Slowly remove hydraulic lines until oil pressure is completely released. Then control the attachment movement by slowly removing the blockage. •Do not enter into the area under attachments, while lowering them.

1.Lowering Arm (Step1)

Gradually loosen the hose of rod side connected to the arm cylinder. 2.Lowering Boom (Step2)

Gradually loosen the hose of head side connected to the boom cylinder.

CAUTION

Clean up all spilled oil. Dispose of all hazardous waste in accordance with local government environmental regulations.

3.Keep the attachment at 30-40 cm (12-16 in) above ground level, taking the occasion of moving the machine into consideration. 4.Securely retighten the hoses not to lower the attachment anymore. 5.After moving the machine to a safe place, get touch the attachment with the ground. 6.Call up a serviceman to have the machine investigated.

NOTE: If necessary, contact your Dealer for advise and/or repairs.

D.SLEWING UPPER SLEWING STRUCTURE

The upper slewing structure has no braking system. Therefore, it is possible to slew the upper slewing structure by means of pushing the attachment with a few persons.

STEP1 STEP2

BOOM (H) ARM (R)