Pruebas Yu Ajustes

Pruebas y Ajustes SUPPLEMENT FOR 320L & 325L EXCAVATORS LONG REACH FRON ATTACH Número de medio -SENR6039-00

Fecha de publicación -01/04/1993

Fecha de actualización -12/10/2001

Testing and Adjusting

Adjustments Introduction Length of booms: 320 L ... 15.6 m (51 ft) 325 L ... 18.2 m (60 ft) The long reach front configuration is different from the standard as follows: * Line relief valve pressure settings * Slow return check valve adjustment * Counterweight Reference: 320 L (1K1, 1TL, 9KK), Service Manuals, SENR6040, SENR6045 and SENR5465. Reference: 325 L (7CJ, 6KK), Service Manual, SENR5400.

NOTICE The following adjustments must be performed to prevent machine damage.

Line Relief Valve Pressure Settings Ver imagen

Main Control Valve (1) Bucket cylinder head end line relief valve. (2) Bucket cylinder rod end line relief valve. (3) Stick cylinder head end line relief valve.

320 Excavator Bucket Cylinder Head And Rod End Lines Adjust line relief valves to ... 19 100 ± 980 kPa (2750 ± 140 psi)

320 Excavator Stick Cylinder Head End Line Adjust line relief valves to ... 22 600 ± 980 kPa (3250 ± 140 psi)

325 Excavator Bucket Cylinder Head And Rod End Lines Adjust line relief valves to ... 19 100 ± 980 kPa (2750 ± 140 psi)

325 Excavator Stick Cylinder Head End Line Adjust line relief valves to ... 20 100 ± 980 kPa (2900 ± 140 psi)

Slow Return Check Valve Adjustment Slow return check valve (2) in the boom cylinder rod end line provides adjustment for boom cylinder speed. Slow return check valve (1) in the stick cylinder head end line provides adjustment for stick cylinder speed. The slow return check valve, when turned clockwise (viewed from the cab side), restricts the return oil flow in these lines to slow down the movement of the front attachment. Ver imagen

Location Of Slow Return Check Valve For Stick Cylinder Head End Line (1) Slow return check valve. Ver imagen

Location Of Slow Return Check Valve For Boom Cylinder Rod End Line (2) Slow return check valve. Ver imagen

Detail Of Slow Return Check Valve

Operational Tests Cylinder Operating Speed Tools Required: Stopwatch Test Conditions: * Place the machine on a level surface * Warm the hydraulic oil temperature to 55 ± 5°C (130 ± 9° F) * Put in power mode 3 * Put in loading (boom raise) priority mode position

Boom Cylinder Retraction Test Ver imagen

Machine Position For Boom Cylinder Retraction Test

Position the machine as shown in the illustration. Measure the time required for the stick end to reach a height of 2000 mm (79 in) above ground level from the maximum digging height position. Adjust the slow return check valve for boom cylinder rod end line to meet the following specifications. 320 L speed must be ... 3.7 ± 0.3 seconds 325 L speed must be ... 3.9 ± 0.3 seconds

Stick Cylinder Extension Test Ver imagen

Machine Position For Stick Cylinder Extension Test

Position the machine as shown in the illustration. Measure the time required for the stick cylinder to reach full extension position from the maximum digging height position. Adjust the slow return check valve for stick cylinder head end line to meet the following specifications. 320 L speed must be ... 4.7 ± 0.3 seconds 325 L speed must be ... 5.3 ± 0.3 seconds

Changing From Long Reach To Standard Reach When changing from the long reach to standard reach configuration, make the following adjustments: 1. Install the standard counterweight. 320 L long reach counterweight ... 4600 kg (10 120 lb) 320 L standard counterweight ... 3800 kg (8360 lb) 325 L long reach counterweight ... 5880 kg (12 936 lb) 325 L standard counterweight ... 4700 kg (10 340 lb)

Before installing counterweight bolts, apply 9S3263 Threadlock to the threads of each bolt. Tighten the bolts to a torque of 1600 ± 200 N·m (1180 ± 150 lb ft). 2. Set the relief valve pressures in bucket cylinder head end line (1), bucket cylinder rod end line (2) and stick cylinder head end line (3) to 33 800 ± 1470 kPa (4900 ± 215 psi). Ver imagen

Main Control Valve (1) Bucket cylinder head end line relief valve. (2) Bucket cylinder rod end line relief valve. (3) Stick cylinder head end line relief valve.

3. Fully open the slow return check valve in the boom cylinder rod end line. See the section, "Slow Return Check Valve Adjustment", for details.

Testing And Adjusting

Troubleshooting NOTE: This section covers testing and adjusting procedures for the attachments, or attachment components, discussed in this module. For testing and adjusting information for the other components refer to the testing and adjusting module in the service manual for the machine being worked on.

Hydraulic oil pressure can remain in the hydraulic systems after the

engine and pump have been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent possible injury, refer to section, Release Of Pressure In The Hydraulic System, before any fitting, hose or component is loosened, tightened, removed or adjusted.

When possible, the bucket must always be lowered to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that boom, stick and bucket have correct support. Swing lock must be engaged before service is started. Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.

Release Of Pressure In The Hydraulic System Release the pressure in the implements hydraulic circuits (boom, stick and bucket) before any hydraulic lines or components are disconnected or removed. 1. Fully retract the rod in the stick cylinder. 2. Adjust the position of the bucket so that is will be flat on the ground. 3. Lower the boom until the bucket is flat on the ground. 4. Shut off the engine and put the hydraulic activation control lever in the UNLOCK position. 5. Move the control levers for boom, bucket, stick and swing to all FULL STROKE positions. This will relieve any pressure that might be present in the pilot system. 6. Slowly loosen the air vent plug on the hydraulic tank and release the pressure. 7. Tighten the air vent plug on the hydraulic tank. 8. The pressure in the system has been released and lines and components can be removed. NOTE: The boom cylinder lines may still have some oil pressure if equipped with boom lowering check attachment. There are bleed valves at the boom cylinders that can be open to relieve any oil pressure that may remain.

Visual Checks A visual inspection of the system is the first step when troubleshooting a problem. Make the inspection with the engine OFF and the Implements lowered to the ground. 1. Check the level of the oil in the hydraulic tank. Slowly loosen the tank filler cap and release the pressure before the cap is removed. 2. Remove the filter element and check it for material that would give an indication of damage to a component. 3. Inspect all lines and connections for damage or leaks. 4. Inspect control linkage for bent, broken or damaged components.

Checks During Operation The checks during operation can be used to find leakage in the system. They can also be used to find a valve or pump that is not working correctly. The speed of rod movement or the torque on a motor can be used to check the condition of the cylinders, motors and the pumps. Raise and lower the boom. Move the stick in and out. Open and closes the bucket. Move the swing control for right and left swing. Do each of these operations several times. 1. Pilot system operation. Since the pilot system controls the movement of spools in the main control valve, it is important the pressure and flow of oil from the pumps be according to specifications. The pressure in the pilot system is controlled by the pilot relief valve. 2. During all machine operations, a main relied valve pressure setting that is low will result in increased cycle times and/or the sound of the main relief valve opening. 3. A main relief pressure that is too high will cause of decreased in the service life of hoses and components. 4. For individual circuit operation, a line relief valve pressure setting that is too low will result in increased cycle times and/or the sound of the relief valve opening for that circuit. 5. Check cycle times for each of the circuits: boom, bucket, stick and swing. Cycle times that are longer than those shown in the specification, see Operational Tests in the specific service manual module for the machine being worked on, could be the result of insufficient pilot system pressure, leakage past cylinder seals, pump wear, pump speed (rpm), faulty relief valve (main or line) or pump control system adjustment.

6. Drift rate for the boom, bucket and stick circuit are greater than those shown in Operational Tests in Hydraulic System Testing And Adjusting for the machine being worked on. Circuit drift (drifting) is caused by leakage past cylinder pistons, O-ring seals in the control valves, check valves or makeup valves that do not seat correctly. Poor adjustment or fit in the pilot and main control valves will also cause drifting. 7. Check machine travel circuits. Operate the machine in the FORWARD and REVERSE direction without moving the control lever for steering. If the machine does not travel in a straight line, there could be a problem with the negative flow control signal to the pumps, motor wear or a line relief valve that is not operating correctly.

Line Relief Pressure Setting In The Single Action Attachment Circuit The line relief valve pressure setting in the single action attachment circuit is set to 17 700 ± 490 kPa (2550 ± 72 psi). Specification of pressure, flow rate, engine rpm may vary with attachment types and/or suppliers. It is very important to follow supplier specifications. Failure to do so could result in poor level performance of the attachment. It is important to record the appropriate engine speed where the respective specifications were obtain. Use the engine speed recorded to operate the attachment for best performance. NOTE: Before starting adjustment of the line relief valve, be sure to check the following: Action alarm lamp (1) for controller (2) comes on in green. Controller alarm indicator and monitor alarm indicator (4) on monitor panel (3) indicates normal (OFF). Ver imagen

Controller Compartment (1) Alarm lamp indicator. (2) Controller.

Ver imagen

Right Console (3) Monitor panel. (4) Controller alarm indicator and monitor alarm indicator. Ver imagen

Flow Meter (5) Supply line to attachment. (6) Return lines from attachment. (7) Flow meter. (8) Valve.

1. Install supply line to attachment (5) to the input of the portable hydraulic tester (7). 2. Attach return line (6) to the output of the portable hydraulic tester (7). Ver imagen

Pump Compartment (A) Upper pump pressure tap.

3. Attach a 34 400 kPa (5000 psi) pressure gauge to upper pump pressure tap (A). 4. Install multitach group on the engine. Ver imagen

Line Relief Valve (9) (10) Locknut. (11) Cap nut.

5. Loosen locknut (10). Loosen cap nut (11), but do not remove. NOTE: Removing the cap nut allows the relief valve to come apart 6. Be sure that the flow meter is in the FULLY OPEN position. 7. Start the engine and get the hydraulic oil temperature to 45 to 55°C (113 to 131°F) 8. Place the power mode switch in MODE II position and the engine speed dial in HIGH IDLE position "10". 9. Depress and hold the attachment control pedal. 10. Slowly turn the flow meter flow valve (8) clockwise to decrease flow. Record the flow meter reading when the pressure reading at pressure tap (A) reaches the pressure point specified by the supplier of the attachment to be used. 11. If the flow measurement is not below or does not meet supplier specification go to STEP 12. If the flow measurement in Step 10 meets or is below the supplier specification do the following. a. Slowly turn adjustment cap nut (11) counterclockwise. Stop turning when the flow meter reading starts to drop. b. Now turn cap nut (11) clockwise until the flow meter reads the flow rate where the specified relief pressure setting was obtained above. NOTE: It would be impossible to get the specified relief pressure setting at the flow rate specified by the supplier.

c. Tighten locknut (10) to a torque of 61 ± 6 N·m (45 ± 4 lb ft) to hold cap nut (11) in place. d. At this time stop flow through the flow meter. Read the pressure at pressure tap (A). This is the line relief valve pressure setting in the attachment circuit. 12. If the flow measurement is beyond the specification do the following: a. Turn the engine speed dial to the LOW IDLE position and then gradually increase engine speed until the flow meter reads the flow rate specified by the supplier. b. Record the speed dial position. c. Slowly turn cap nut (11) counterclockwise. Stop turning when the flow meter reading starts to drop. d. Turn cap nut (11) clockwise until tflow through he flow meter meets supplier specification. e. Tighten locknut (10) to a torque of 61 ± 6 N·m (45 ± 4 lb ft) to hold cap nut (11) in place. f. At this time stop flow through the flow meter. Read the pressure at pressure tap (A). This is the line relief valve pressure setting in the attachment circuit.

Boom Lowering Check Test Boom Cylinder Drift 1. Start the engine. 2. Fully extend the bucket cylinder. 3. Full retract the stick cylinder. 4. Raise the boom until the booms upper surface becomes parallel to the ground and stop the engine. 5. Leave the machine in this position for 3 minutes. 6. Measure the boom cylinder drift. The drift rate of the boom cylinder should be less than 2.0 mm/min (.08 in/min).

Test Manual Boom Lower Function 1. Start the engine. 2. Fully extend the bucket cylinder.

3. Full retract the stick cylinder. 4. Raise the boom until the booms upper surface becomes parallel to the ground and stop the engine. Ver imagen

Check And Relief Valve (1) Locknut. (2) Screw.

NOTE: The following steps must be done to the right and left check and relief valve at the same time. 5. Loosen locknut (1) on both valves. 6. Slowly loosen screw (2) on both valves. 7. The boom should drop slowly and no oil leakage should be seen. NOTE: A small amount of oil at screw (2) is not an indication of a problem.

Test Boom Cylinder Head End Relief Valve

See Testing And Adjusting, Form SENR5406

Fine Swing Fine Swing Function To check the function of the fine swing control stop the swing operation and turn the fine swing control switch ON. A very small amount of swing drift should be seen when the switch is turned ON.