- Asphalt Paver
- AP1000F (S/N: AC41-UP)
- AP1055F (S/N: TJ51-UP)
- AP600F (S/N: AP61-UP; LR61-UP)
- AP655F (S/N: 4801-UP; 4521-UP; 4531-UP; P651-UP; 6551-UP; MH61-UP; ML61-UP; 4791-UP)
- AP1055F (S/N: TJ51-UP)
Introduction
This Special Instruction contains the procedure to bleed the conveyor charge pump on certain AP1000F, AP1055F, AP600F, and AP655F Asphalt Pavers.
After the hydraulic system has been drained and refilled, or the gear pump is serviced, the gear pump may be air locked upon first start-up. Upon first start-up after servicing, the augers and conveyors may not rotate in either manual or automatic operation. Perform the following procedure to bleed the air from the conveyor charge pump circuit.
Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.
Safety Section
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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Cat dealer for replacement manuals. Proper care is your responsibility. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 1 | g00104545 |
Procedure To Bleed the Conveyor Charge Pump
- Disconnect the vibratory supply hose at the screed connection. The dash 12 vibratory supply connection has a test port at the tee. Disconnect the hose directly before this tee fitting as indicated in Illustration 2.
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Illustration 3 g06184982 View showing the vibratory supply fitting on the paver Note: Some models do not have a test port as described. Locate the vibratory supply fitting on the paver, as shown in illustration 3. Follow that hose to screed, and disconnect there.
- Place the disconnected hose in a suitable container (such as a large bucket).
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Illustration 4 g06086358 View showing "Pave" mode - Start the engine. Place machine in the "Pave" mode.
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Illustration 5 g06086374 View showing "Parking Brake" - Engage "Parking Brake".
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Illustration 6 g06086378 View showing propel lever and propel lever trigger - Squeeze propel lever trigger and place propel lever "Forward".
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Illustration 7 g06086384 View showing "Compaction" button - Press "Screed Display" button on the left side of the display to enter "Compaction" screen.
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Illustration 8 g06086396 View showing "Screed Vibe" icon on compaction screen - Touch "Screed Vibe" icon on the compaction screen. "Screed Vibe" icon will turn green.
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Illustration 9 g06086413 View showing "Manual" buttons - Observe disconnected hose for oil flow.
If steady oil flow is present:
- turn off "Vibratory" function
- shutdown machine
- reconnect hose on screed
- restart engine and check the conveyor/auger function by holding "Manual" buttons
Augers and conveyors should rotate.
After 20 seconds, if steady oil flow is not present:
- perform Step 9
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Illustration 10 g06086428 View showing throttle switch - Hold throttle switch to slowly increase engine idle, while observing disconnected hose for steady oil flow. When steady oil flow is observed, place engine in low idle and shutdown machine. Reconnect hose on screed. Restart machine and check augers/conveyors for operation.
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| Illustration 2 | g06185015 |
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View showing location of hose connection to disconnect | |
