testing and adjusting bomba hidraulica d6n- aly

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Testing and AdjustingD6N Track-Type Tractor Hydraulic System

Media Number -RENR5273-04 Publication Date -01/06/2006 Date Updated -27/06/2006

i01793134

Hydraulic Pump Efficiency - Test

SMCS - 5073-032-TB; 5073-032-ON

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A pump efficiency test is designed to tell if a pump is operating within design parameters.A pump efficiency test should be performed if cylinder cycle time is slow.

Una prueba de la eficiencia de la bomba est diseada para saber si unabomba est operando dentro de los parmetros de diseo. Una prueba de la

eficiencia de la bomba debe realizarse si el tiempo de ciclo del cilindro es lento.

Note: The oil in the hydraulic system must be the oil which is recommended in the

Operation and Maintenance Manual. The oil must be at a temperature of 65 3C (149

5F).

Nota: El aceite en el sistema hidrulico debe ser el aceite que se recomienda enel Manual de Operacin y Mantenimiento. El aceite debe estar a una

temperatura de 65 3 C (149 5 F).

Test on Bench

For any pump test, the pump flow that is measured at 690 kPa (100 psi) is larger than thepump flow that is measured at 6900 kPa (1000 psi) at the same rpm.

The difference between the pump flow of two operating pressures is the flow loss.

If the test bench can be run at 6900 kPa (1000 psi) at 2000 rpm, find the percent of flow

loss with Formula I.Prueba en bancoPrueba en banco


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Prueba en banco

Para cualquier prueba de la bomba, el caudal de la bomba que se mide a 690 kPa (100 psi)es mayor que el caudal de la bomba que se mide a 6900 kPa (1000 psi) a las mismas rpm.

La diferencia entre el caudal de la bomba de dos presiones de operacin es la prdida de

flujo.

Si el banco de pruebas se puede ejecutar en 6900 kPa (1000 psi) a 2.000 rpm, calcular el

porcentaje de prdida de flujo con la Frmula I.

Formula I

Table 1

L/min (US gpm) at 690 kPa (100 psi) at 2000 rpm - L/min (US

gpm) at 6900 kPa (1000 psi) at 2000 rpm 100

= Percent offlow lossL/min (US gpm) at

690 kPa (100 psi) at 2000 rpm

If the percent of flow loss is more than 10 percent, pump performance is not adequate.

If the test bench cannot be run at 6900 kPa (1000 psi) at 2000 rpm, run the pump shaft at1000 rpm. Measure the pump flow at 690 kPa (100 psi) and at 6900 kPa (1000 psi). Usethese values in the top part of Formula II. For the bottom part of the formula, run the pump

shaft at 2000 rpm. Measure the pump flow at 690 kPa (100 psi).

Formula II

Table 2

L/min (US gpm) at 690 kPa (100 psi) at 1000 rpm - L/min (US

gpm) at 6900 kPa (1000 psi) at 1000 rpm

100

= Percent of

flow lossL/min (US gpm) at690 kPa (100 psi) at 1000 rpm

If the percent of flow loss is more than 10 percent, pump performance is not adequate.

Test on Machine


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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 theengine 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.

NOTICE

Care must be taken to ensure that fluids are contained duringperformance 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, "Caterpillar Tools and Shop

Products Guide" for tools and supplies suitable to collect and contain

fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.

NOTICE

Keep all parts clean from contaminants.

Contamination of the hydraulic system with foreign material will

reduce the service life of the hydraulic system components.

To prevent contaminants from entering the hydraulic system, always

plug or cap the lines, fittings, or hoses as they are disconnected. Cover

any disassembled components and clean them properly before

assembly.

Clean the hydraulic system properly after any major component

exchange or especially after a component failure, to remove any

contamination.


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Note: Before performing this test, perform the Neutral Adjustment of the Steering Pump.Do not move the steering control lever during this test. The flow from the charge pump

must be the only flow from the steering circuit during this test.

Table 3

Required Tools

1165-0021 Hose with an ID of

25.4 mm (1 inch) (Approximately

1 m (3 ft) in length)

1 8T-0454 Flow Meter

2 3B-7252 Reducing Bushings

2 8C-6875 Connectors

2 6V-9958 Collet Stems

View Image

Illustration 1 g00930245

1. Attach the 3B-7252 Reducing Bushings to the 8T-0454 Flow Meter. Attach the 8C-6875 Connectors to the 3B-7252 Reducing Bushings in order to complete the flowmeter assembly.
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2. Remove the nut and the washer and remove clip (3) from the stud.3. Disconnect hose assembly (2) from the inlet to the hydraulic tank. Attach hose

assembly (2) to the flow meter assembly.

Note: Correct orientation of the flow meter is necessary. The flow of oil that istested is case drain oil and the oil flows from the filter base to the hydraulic tank.

4. Attach the 6V-9958 Collet Stems to the 165-0021 Hose in order to complete thehose assembly. Attach this hose assembly to the inlet to the hydraulic tank (1) and

to the flow meter assembly.

Run the engine at HIGH IDLE. Stall one of the attachment cylinders. Observe the flow of

oil through the flow meter while the cylinder is stalled. Do not keep any cylinder in a

stalled position for more than 10 seconds. Do not return a cylinder to a stalled positionwithin 30 seconds of the prior stalled position. The charge pump in the steering circuit

produces a flow of approximately 47 L/min (12.5 US gpm). Subtract 47 L/min (12.5 USgpm) from the reading on the flow meter in order to calculate the flow from the case drainof the implement pump. If the flow that is calculated exceeds 15 L/min (4 US gpm), pump

performance is not adequate.1 1 -1

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