Specifications
Note: A New specification is the performance that can be expected for a new machine. A Rebuild specification is the performance that can be expected after rebuilding the components of a system. Performance beyond Service Limit specifications is an indication of these problems: improper adjustment, wear, damage of relief valves and damage of pumps.
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| Illustration 1 | g00340532 |
Relief valve locations (A) Main (B) Boom cylinder line (head end) (C) Boom cylinder line (rod end) (D) Stick cylinder line (head end) (E) Stick cylinder line (rod end) (F) Bucket cylinder line (head end) (G) Bucket cylinder line (rod end) (H) Swing (right) (I) Swing (left) (J) Left travel crossover relief valve for forward travel (upper valve) (K) Left travel crossover relief valve for reverse travel (lower valve) (L) Right travel crossover relief valve for forward travel (upper valve) (M) Right travel crossover relief valve for reverse travel (lower valve) (N) Pilot relief valve (O) Main control valve (P) Pilot manifold (Q) Travel motor (right) (R) Travel motor (left) (S) Swing motor | |
| Relief Valve | Specifications | Torque for Locknut | ||
|---|---|---|---|---|
| New | Rebuild | Service Limit | ||
| (A) Main relief valve | 34300 ± 490 kPa (4950 ± 72 psi) |
34300 ± 490 kPa (4950 ± 72 psi) |
32340 to 34790 kPa (4700 to 5050 psi) |
50 ± 10 N·m (37 ± 7 lb ft) |
| (B) Boom cylinder line (head end) | 36800 ± 1470 kPa (5350 ± 215 psi) |
36800 ± 1470 kPa (5350 ± 215 psi) |
33850 to 38270 kPa (4920 to 5565 psi) |
20 ± 2 N·m (14 ± 4 lb ft) |
| (C) Boom cylinder line (rod end) | ||||
| (D) Stick cylinder line (head end) | ||||
| (E) Stick cylinder line (rod end) | ||||
| (F) Bucket cylinder line (head end) | ||||
| (G) Bucket cylinder line (rod end) | ||||
| (H) Swing relief pressure (right) | 29900 ± 980 kPa (4350 ± 140 psi) |
29900 ± 980 kPa (4350 ± 140 psi) |
27940 to 30880 kPa (4050 to 4475 psi) |
160 ± 30 N·m (120 ± 22 lb ft) |
| (I) Swing relief pressure (left) | ||||
| (J) Left travel crossover relief valve (forward) | 36800 ± 1470 kPa (5350 ± 215 psi) |
36800 ± 1470 kPa (5350 ± 215 psi) |
33850 to 38270 kPa (4920 to 5565 psi) |
130 ± 13 N·m (95 ± 10 lb ft) |
| (K) Left travel crossover relief valve (reverse) | ||||
| (L) Right travel crossover relief valve (forward) | ||||
| (M) Right travel crossover relief valve (reverse) | ||||
| (N) Pilot relief valve | 4100 ± 200 kPa (595 ± 29 psi) |
4100 ± 200 kPa (595 ± 29 psi) |
4100 ± 200 kPa (595 ± 29 psi) |
16 ± 1 N·m (12 ± 1 lb ft) |
| Required Tools | ||
| Part Number | Description | Qty |
| 6V-2100 | Multitach group | 1 |
| 6V-4161 | Hydraulic testing group | 1 |
| 8T-0470 | Thermometer group | 1 |
| Relief Valves | Pressure change With One Turn Of Adjustment Screw |
|---|---|
| Main valves | 14400 kPa (2100 psi) |
| Line relief valve | 11000 kPa (1600 psi) |
| Swing relief valve | 11200 kPa (1625 psi) |
| Travel crossover relief valve | 3050 kPa (440 psi) |
| Pilot relief valve | 690 kPa (100 psi) |
Preparation For Relief Valve Adjustment
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| Illustration 2 | g00363032 |
Pump Compartment (1) Pressure tap (power shift pressure) (2) Pressure tap (upper pump delivery pressure) (3) Pressure tap (lower pump delivery pressure) | |
- Position the machine on level ground.
- Stop the engine.
- Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release".
- Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (2). Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (3) .
- Connect a 4000 kPa (580 psi) pressure gauge to pressure tap (1) .
- Start the engine.
- Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
- Place the machine controls at the following settings: Power Mode, engine speed dial "10" and AEC switch OFF.
Reference: Make reference to Testing And Adjusting, "Operational Checks" for engine rpm settings.
Note: Normal operations of the engine and pumps are necessary for the pressure adjustments. If the results of the pressure adjustment are not correct, then the engine and the pump characteristic curve needs to be checked. Slow output flow from the pump is an indication of air in the hydraulic system. Make sure that no air is present in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release".
Temporary Setting Of The Main Relief Valve
Note: A temporary setting of the main relief valve is required before any line relief valve can be adjusted.
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| Illustration 3 | g00341013 |
Top of main control valve (4) Adjustment screw (5) Locknut (6) Main relief valve | |
- Open the bucket until the bucket cylinder rod is at the full retraction.
- Be sure that the main relief valve pressure is set at 34300 ± 490 kPa (4950 ± 72 psi).
- Loosen locknut (5). Turn the adjustment screw (4) clockwise for one half turn. Tighten locknut (5) .
Note: Always make final pressure adjustments on pressure rise.