345C UHD Excavator and 345C Mobile Hydraulic Power Unit Caterpillar

Connect the Boom

Note: Perform this procedure on a surface that is flat and level.

Illustration 1	g00888213
(1) Bracket in straight configuration (2) Setscrew for straight configuration (3) Bracket in bent configuration (4) Setscrew for bent configuration

Note: Illustration 1 shows the retrofit configurations. The bracket is useless with the Ultrahigh Demolition Configuration.

1. Install the bracket onto the boom nose. Align the bracket for the proper configuration. The bracket can be rotated 180 ° for either the straight configuration or the bent configuration.

   1. In order to use the Bent Configuration, the brackets should be beneath the boom foot and facing the machine. The machine is assembled with the boom foot only. Place the retrofit configuration on the stand. The stick is set down on the floor. The base machine will hook the fixed pin PT 500 with a boom up. When the boom down is in the down position, bring the setting bolt of the retrofit boom toward the counterweight against the boom foot. Fix the expandable pin in the PT 601.

   2. In order to use the Straight Configuration, remove the expandable pin from the PT 601 without a stand. Do a complete boom down. Position the bracket 180 °. The setting bolt should now be oriented toward the stick. Place the boom in the up position. Place the plate against the setting bolt of the bracket. Fix the expandable pin in the PT 600.

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Illustration 2	g01105473
Ultrahigh Demolition Configuration

2. Start the engine. Move the machine forward in order to align the boom nose with the boom foot.

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Illustration 3	g01106011
Ultrahigh Demolition Configuration

3. Raise the boom foot. Engage the hooks on the boom foot with the pin on the boom nose. Raise the boom until the boom foot contacts the stop screws on the boom nose.

   Note: Select the appropriate lower position in order to have the desired configuration.

4. Remove the chains.

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Personal injury or death can result from lifting a heavy component. The heavy component can fall if using an incorrect hoist and/or sling or fastener to lift the load. Be sure the hoist and other devices have the correct lifting capacity to lift a heavy component. The approximate weight of the heavy component is given below.

Note: The expandable pin assembly weighs approximately 77.5 kg (171 lb). Use a suitable lifting sling as a choke on the pin. Attach the lifting sling to a hoist. Use the hoist and the lifting sling for supporting and maneuvering the pin.

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Illustration 4	g00888349
(5) Bolt (6) Sleeve (7) Pin (8) Release Bolt (9) Washer (10) Bolt

5. Grease the sleeves for the pins with Molybdenum Grease. Also grease the ends of the bolts and the expandable pin with Molybdenum Grease.

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Illustration 5	g00888367
(5) Bolt (6) Sleeve (7) Pin (9) Washer (10) Bolt (11) Boom nose (12) Boom Foot

6. Install the expandable pin into the bores of the boom and center the pin with the width of the structure.

7. Mount the sleeves (5) inside the bores of the boom nose (11). On each face of the sleeves, tighten washer (9) with four bolts (5). There must always be a gap between the washer and the boom nose.

8. Repeat Step 7 on the opposite side of the pin.

9. Tighten expandable pin (7) on washer (9) with bolt (10) .

10. Repeat Step 9 on the opposite side of the pin.

11. Tighten each bolt (10) to the correct torque.

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Illustration 6	g01099948
Bolt Size Metric Recommended Torque 900 ± 70 N·m (660 ± 50 lb ft)

12. Check the clearance between the face of the boom nose (11) and the face of the washer (9). The distance (L) must be larger than 0.

Connect the Hydraulics

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Illustration 7	g01106021
Location of pilot coupling (13) (14) Pi FLCV Port (15) Pi SLCV Port (16) AUX Port (17) RET Port (18) AUX Port (19) DR Port

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Illustration 8	g01192617
Pilot coupling (13)

1. Lift the dust cover (24) on the mounted coupling (22) .

2. Press the locking button (21) and lift the lever (20) in order to engage the roll pins.

   1. Place the hydraulic block group (23) on the mounted coupling (22) and insert the reference pins in the proper holes.

   2. Be sure that the roll pins are securely fastened in the cam curves.

   3. Lower the lever (20) in order to lock the coupling assemblies together until the locking button (21) releases.

      Note: Be sure that the locking button (21) releases once the connection is completed.

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Illustration 9	g01192640
Ultrahigh Demolition Configuration (13) Pilot Coupling (25) Ball Valves (26) Quick Connectors

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Illustration 10	g01192651
Retrofit Configuration (13) Pilot Coupling (25) Ball Valves (26) Quick Connectors

3. If the machine is equipped with the quick connect ball valve use step 4 in order to connect the quick coupler arrangement. If the machine is equipped with the quick connectors (26) use step 5 in order to connect the quick coupler arrangement.

4. Connect the quick connect ball valve by using the following instructions.
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   Illustration 11	g01192338
   (27) Fixed ball valve (28) Mobile ball valve (29) Drain Plug

   1. Remove the cover plates from the fixed ball valve (27) and the mobile ball valve (28) .

   2. Connect the mobile ball valve (28) to the fixed ball valve (27) .

   3. Install the bolts into the mobile ball valve (28) .

   4. Open the fixed ball valve (27) and open the mobile ball valve (28). Use the levers that are located in the tool box in order to open the ball valves.

   5. Place drain plugs (29) into the leakage oil ports.

5. Connect the quick connectors (26) by using the following instructions.
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   Illustration 12	g01192662

   1. Remove the dust caps from the male coupling of the quick disconnect. Remove the dust caps from the female coupling of the quick disconnect. Carefully clean all mating surfaces of the coupling for the quick disconnect.

   2. Hold the flat face of the female end (32) of the coupling against the male end (30) of the coupler. Hold the female end (32) forward and rotate the main sleeve (33) clockwise.

   3. Continue the manual connection if pressure is not felt. If pressure is detected use an open wrench and turn the coupler clockwise until the connection is completed. The completed connection is determined by the automatic feed of the sleeve (31). This will prevent the incidental loosening of the hose due to vibration.

   4. Connect the male dust caps and the female dust caps together.

      Note: Always connect the dust cap to another dust cap when the coupling for the quick disconnect is active. This keeps dirt and other foreign material from contaminating the hydraulic system.

6. Remove the caps and the plugs from the hydraulic fittings.

7. Install the bolts, clamps, and the hydraulic hoses for the ball valves (25) that are located on the boom foot.

8. Open the four ball valves (25) .

Purging the Hydraulic Circuits

After the assembly of the front parts and reconnection of the hydraulic lines, it is necessary to purge all of the hydraulic lines.

Special attention should be given to the following hydraulic lines:

• Load sensing line from the fore boom valve

• Two pilot lines from the fore boom valve

• Pilot line from the stick lowering control valve

In order to improve the purging process, nipples have been installed on some hydraulic lines.

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Illustration 13	g01105450

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Illustration 14	g01105452

1. When the boom foot has been connected to the boom nose, loosen screw (22) and nipple (21) of the load sensing lines that are located at the bottom of boom foot (12) .

   In order to purge the lines, connect hose (H), connector (I) and coupler (J) to the nipples.

   Note: Store the items in the storage box of the machine.

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Illustration 15	g01105454
(23) Plug (24) Nipples (11) Boom nose (C) Fore boom cylinder (D) valve

2. Loosen plug (23) on valve (D) that is located on fore boom cylinder (C). Loosen the two nipples (24) on the pilot lines.

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Illustration 16	g01105456

3. Loosen nipples (25) that are located on the pilot line of the stick cylinder.

4. Slowly extend and retract the fore boom cylinder. Slowly raise and lower the boom. When hydraulic oil begins to leak through the couplings and the nipples, tighten all of the couplings.

5. After all of the front parts have been assembled, purge the rest of the hydraulic lines.

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Illustration 17	g01105457

6. Loosen plug (27) on lowering valve (26) for the work tool that is located on the tool cylinder.

7. Slowly raise the boom. Extend and retract the stick cylinder and the tool cylinder. When hydraulic oil starts to leak from the plugs and the nipples, tighten the plugs.

Checking the Installation of the Boom

1. Start the engine. Check for leaks. Repair any leaks before operating the machine.

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Illustration 18	g01099948

2. Operate the machine for one hour. Check the tightness of the bolts (10). If necessary, tighten the bolts (10) .

3. Check the clearance between the face of the boom nose (11) and the face of the washer (9). The distance (L) must be larger than 0.

4. Operate the machine for two to three hours. Check the tightness of the bolts (10). If necessary, tighten bolts (10). If the bolts are not tight, tighten the bolts and repeat Steps 12 and 4.

If the torque value of the bolts (10) is correct, check the tightness of the bolts at regular maintenance intervals. Refer to the Operation and Maintenance Manual, "Maintenance Interval Schedule" for the proper intervals.