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Producto: BACKHOE LOADER Modelo: 442D BACKHOE LOADER BRG Configuración: 442D Backhoe Loader BRG00001-00827 (MACHINE) POWERED BY 3054 Engine

Pruebas y Ajustes
416D, 420D, 424D, 428D, 430D, 432D, 438D and 442D Backhoe Loaders Hydraulic and Steering System
Número de medio-RENR3584-05 Fecha de publicación -01/10/2004 Fecha de actualización -26/10/2004

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Hydraulic Pump - Test and Adjust
SMCS - 5070-025; 5070-081 S/N - B2D1-UP S/N - BFP1-UP S/N - BGJ1-1049 S/N - BGP1-UP S/N - BKC1-919 S/N - BKG1-UP S/N - BKR1-UP S/N - BLD1-UP S/N - BLL1-UP S/N - BLN1-UP S/N - BMC1-1059 S/N - BML1-UP S/N - BMT1-UP S/N - BNB1-UP S/N - BNK1-UP S/N - BNS1-UP S/N - BPE1-UPhttps://10.100.28.25:8443/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/s... 03/03/2010

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S/N - BPN1-UP S/N - BRG1-UP S/N - BRY1-UP S/N - CXP1-UP S/N - FDP1-UP

Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine. To preventpossible injury, perform the procedure that follows before testing and adjusting the hydraulic system.

Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctorfamiliar with this type of injury. Always use a board or cardboard when checking for a leak.

Table 1 Required Tools Part Number 6V-4143 177-7860 8T-0856 8T-0860 8C-3417 4C-9910 6V-8946 6V-9831 123-3893 Description Couplers Hose Assemblies Pressure Gauges Pressure Gauge Elbows Flow Meter Reducer Assemblies Cap Assembly Cap Assembly Quantity 4 2 2 2 2 1 2 1 1https://10.100.28.25:8443/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/s... 03/03/2010

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6V-3989 8T-0857

Fittings Pressure gauge

4 1

Illustration 1 (1) Hydraulic pump (2) Flow compensator valve (3) Pressure compensator valve (4) Signal pressure tap

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Signal pressure tap (4) is located on hydraulic pump (1) . Flowcompensator valve (2) and pressure compensator valve (3) are also located on hydraulic pump (1) . Access is gained from the bottom of the machine or access is gained by removing the floorplate.

Illustration 2 (5) System pressure tap

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The system pressure tap (5) is located on the block for the pump discharge pressure. Access is gained from the bottom of the machine. Pump dischargepressures are known values. The pump discharge pressures can be tested during two

https://10.100.28.25:8443/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/s... 03/03/2010

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specific conditions. low pressure standby high pressure stall Prior to making any pump adjustments, perform "Low PressureStandby Test", "Margin Pressure Test" and "High Pressure Stall Test". Increase the hydraulic oil temperature to the operating temperature by installing the boom lock and stalling the boom down for 60 seconds. Check for leaks.

Assembly of the Hose Assemblies
1. Install one 6V-4143 Coupler to each end of the 177-7860 Hose Assemblies . 2. Install one 6V-3989 Fitting to each pressure gauge.

LowPressure Standby Test
1. Start the engine. 2. Lower the work tool on the front of the machine and the stabilizers to the ground. Engage the parking brake. Stop the engine. 3. Turn the engine start switch key to the ON position. 4. Move the hydraulic hand controls to all the positions in order to release system pressure. 5. Turn the engine start switch key to the OFF position. 6. Remove the metal...