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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. |
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Personal injury can result from contact with hot hydraulic oil and from contact with hydraulic oil that is under high pressure. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. The hydraulic oil pressure must be released before any service on the hydraulic system is performed or serious personal injury could occur. Verify that all of the work tools have been completely lowered to the ground. Release the hydraulic oil pressure at the hydraulic tank through the breaker relief valve when the breaker relief valve is cool enough to touch with your bare hand. Verify that the hydraulic oil is cool before you begin to remove any hydraulic components or hydraulic lines. |
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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, "Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids. Dispose of all fluids according to local regulations and mandates. |
| Pressure Reducing Valve (Feed Reduction) | ||
|---|---|---|
| Date | Equipment ID Code | |
| Function | Setting | Actual |
| Rotate / Wrist CW. | |
|
| Rotate / Wrist CCW. | ||
| Swing Left | |
|
| Swing Right | ||
| Grab (Open) | |
|
| Grab (Close) | ||
| Accumulator (Open) | |
|
| Accumulator (Close) | ||
| Boom UP | |
|
| Intermittent Saw | |
|
| Tilt Left | |
|
| Tilt Right | ||
| Tilt Forward | ||
| Tilt Back | ||
This information includes the following test:
- Pressure Reducing Valve (Feed Reduction) Test
| Required Tools | ||
| Part Number | Description | Qty |
| 198-4240 | Digital Pressure Indicator | 1 |
| 177-7861 | Hose Assembly | 1 |
Use the information in the reference to prepare the machine for this test. Also, use the information in the reference to relieve any system pressure that may be present in the hydraulic system.
Reference: For the correct procedure to prepare the machine for this test, refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
- Place the machine on level ground.
- Start the engine.
- Run the engine at high idle.
- Warm the hydraulic oil to normal operating temperature. Normal operating temperature is
50 ± 5°C (122 ± 10°F) .Show/hide table
Illustration 1 g02593658 Initial IQAN display Show/hide table
Illustration 2 g02595281 - Press function key (F2) to view the system pressures.
Show/hide table
Illustration 3 g01162712 The hydraulic lockout control in the UNLOCKED position - Move the hydraulic lockout control to the UNLOCKED position.
- Operate each of the following functions in table 1. The functions are equipped with pressure reducing valves. Monitor the pressure from the cab.
- Record the readings on the display. If the readings are correct, proceed to Step 15. If a function needs to be adjusted, proceed to Step 9.
Show/hide table
Illustration 4 g02587947 The switch for the hood Show/hide table
Illustration 5 g01074453 - Open the hood for the engine compartment.
- Shut off the engine.
- Release the pressure in the hydraulic system.
Reference: For the correct procedure to relieve any hydraulic oil pressure that may be in the hydraulic system, refer to Testing and Adjusting, "System Pressure - Release"
for the machine that is being serviced.Show/hide table
Illustration 6 g02750903 (1) Pressure tap on the main pump - Attach the 198-4240 Digital Pressure Indicator to pressure tap (1) with the hose assembly.
- Restart the engine and record the pressures.
Show/hide table
Illustration 7 g02751080 Signal limiter valves on the implement control valve for 521B machines.
(2) Accumulator control valve
(3) Swing control valve
(4) Boom control valve
(A) Accumulate CLOSE
(B) Accumulate OPEN
(C) Swing COUNTER CLOCKWISE
(D) Swing CLOCKWISE
(E) Boom UPShow/hide table
Illustration 8 g02751100 Signal limiter valves on the implement control valve for 522B machines.
(5) Accumulator control valve
(6) Swing control valve
(7) Tilt side control valve
(8) Tilt forward control valve
(9) Boom control valve
(F) Accumulate CLOSE
(G) Accumulate OPEN
(H) Swing COUNTER CLOCKWISE
(J) Swing CLOCKWISE
(K) Tilt RIGHT
(L) Tilt LEFT
(M) Tilt BACK
(N) Tilt FORWARD
(P) Boom UPShow/hide table
Illustration 9 g02751439 Signal limiter valves on the intermittent saw travel control valve.
(10) Wrist control valve
(11) Grab control valve
(12) Intermittent saw control valve
(13) Intermittent saw control valve
(R) Wrist COUNTER CLOCKWISE
(S) Wrist CLOCKWISE
(T) Grab CLOSE
(U) Grab OPEN
(V) Intermittent Saw
(W) Manual return
(X) Intermittent Saw
(Y) SpareShow/hide table
Illustration 10 g02751682 Signal limiter valves on the travel control valve.
(14) Wrist control valve
(15) Grab control valve
(Z) Wrist / Rotate COUNTER CLOCKWISE
(AA) Wrist / Rotate CLOCKWISE
(AB) Grab CLOSE
(AC) Grab OPEN - Adjust the function to the pressure in Table 1.
- Move the engine speed dial to low idle. Shut off the engine.
- Release the pressure in the hydraulic system.
Reference: For the correct procedure to relieve any hydraulic oil pressure that may be in the hydraulic system, refer to Testing and Adjusting, "System Pressure - Release"
for the machine that is being serviced. - Remove the test equipment.
