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| Illustration 1 | g00555482 |
657EWheel Tractor-Scraper (1) Motor case drain filter (2) Piston motor (auger) (3) Auger (4) Cutting edge (5) Gear pump (charge) (6) Piston pump (auger) | |
| NOTICE |
|---|
Push loading a wheel tractor-scraper with an auger can cause serious damage to the auger. In order to prevent damage to the auger, do not push load a wheel tractor-scraper that is equipped with an auger. |
Auger (3) elevates material into the scraper bowl. This reduces the rimpull that is needed to power cutting edge (4) through new material. Auger (3) breaks up slab material for easier loading and unloading. Also, auger (3) can handle a wide variety of materials.
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| Illustration 2 | g00561351 |
(1) Motor case drain filter | |
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| Illustration 3 | g00561360 |
(5) Gear pump (charge) (6) Piston pump (auger) | |
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| Illustration 4 | g00561361 |
(7) Charge pump filter (8) Hydraulic oil tank | |
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| Illustration 5 | g00561388 |
(9) Pump case drain filter | |
Auger (3) has a totally independent hydraulic system. The hydraulic system includes the following components.
- Motor case drain filter (1)
- Piston motor (auger) (2)
- Piston pump (auger) (6)
- Charge pump filter (7)
- Pump case drain filter (9)
- Hydraulic cooler
The hydraulic system provides optimum speed and optimum torque at auger (3) .
Auger (3) should be rotating clockwise when the machine is both loading and unloading. Piston motor (2) is a two-speed motor. Auger (3) normally rotates at 51 RPM. When the load on auger (3) significantly increases, the speed of the auger will decrease to the lower speed. This will provide increased torque in order to finish loading the scraper bowl.
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| Illustration 6 | g00558051 |
(10) Reverse switch | |
| NOTICE |
|---|
Reversing the auger can cause serious damage to the support bridge. In order to prevent damage to the support bridge do not reverse the auger more than 178 ± 25 mm (7 ± 1 inch). |
The direction of the auger may be reversed. If auger (3) becomes jammed, auger (3) may manually be jogged in a counterclockwise direction by operating reverse switch (10) .
Auger (3) has the following three important components that experience the most wear:
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| Illustration 7 | g00557866 |
Typical Example | |
- Cutting edge (11)
- Wear shoes (12)
- Rock deflector (13)
Scraper Power Limiter Control for the 657E Wheel Tractor-Scraper
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| Illustration 8 | g00558071 |
(14) Scraper power limiter control | |
Scraper power limiter control (14) is located to the right of the operator. This control reduces the power of the scraper engine. This control also reduces tire slippage. This control is only found on wheel tractor-scrapers that are equipped with a rear engine.
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| Illustration 9 | g00558072 |
(15) Auger Control | |
Note: When auger control (15) is in the ON position, scraper power limiter control (14) will operate. Scraper power limiter control (14) will not operate when auger control (15) is in the OFF position.
When scraper power limiter control (14) is on, a signal is sent to a solenoid on the rear engine. This solenoid blocks the turbocharger boost that comes from the aftercooler. When the solenoid blocks the signal, the governor thinks that the engine is receiving low boost. This tells the governor that the engine needs a low amount of fuel. The low amount of fuel causes the engine to have less power.
Electronic Monitoring System (EMS)
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| Illustration 10 | g00558073 |
The Electronic Monitoring System (EMS) alerts the operator that one or more of the hydraulic filters needs to be replaced.
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| Illustration 11 | g00558074 |
(2) Piston motor (auger) (3) Auger (6) Piston pump (auger) (16) Port (17) Hydraulic oil line (18) Crossover relief valve (19) Port (20) Gearbox (21) Hydraulic oil line (22) Port | |
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| Illustration 12 | g00558072 |
(15) Auger control | |
When auger control (15) is moved to the ON position, a charge of 24 volts DC is sent to piston pump (6). The solenoid tilts the swashplate. This causes piston pump (6) to pump hydraulic oil through port (16). The hydraulic oil flows to port (17) and into the piston motor (2). The hydraulic oil will rotate piston motor (2). This causes gearbox (20) and auger (3) to rotate. Then, the hydraulic oil flows from piston motor (2) through hydraulic oil line (2). Then, hydraulic oil flows to port (22) .
If the system pressure exceeds the pressure setting of crossover relief valve (18), crossover relief valve (18) will open. Then, hydraulic oil bypasses piston motor (2). This allows the hydraulic oil to flow to hydraulic oil line (21) .