Specifications
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| Relief Valve | Specifications | |||
|---|---|---|---|---|
| New (1) | Rebuild | Service Limit (2) | ||
| Main relief valve | P1 | 21700 ± 500 kPa (3150 ± 75 psi) |
21700 ± 500 kPa (3150 ± 75 psi) |
|
| P2 | 21700 ± 500 kPa (3150 ± 75 psi) |
21700 ± 500 kPa (3150 ± 75 psi) |
||
| P3 | 18050 ± 450 kPa (2620 ± 65 psi) |
18050 ± 450 kPa (2620 ± 65 psi) |
||
| Boom cylinder line (head end) | 25250 ± 250 kPa (3660 ± 35 psi) |
25250 ± 250 kPa (3660 ± 35 psi) |
||
| Boom cylinder line (rod end) | ||||
| Stick cylinder line (head end) | ||||
| Stick cylinder line (rod end) | ||||
| Bucket cylinder line (head end) | ||||
| Swing relief pressure (right) | 16500 ± 500 kPa (2400 ± 75 psi) |
16500 ± 500 kPa (2400 ± 75 psi) |
||
| Swing relief pressure (left) | ||||
| Pilot relief valve | 3400 ± 200 kPa (495 ± 30 psi) |
3400 ± 200 kPa (495 ± 30 psi) |
||
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| ( 1 ) | 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. |
| ( 2 ) | Performance beyond Service Limit specifications is an indication of these problems: improper adjustment, wear, damage of relief valves and damage of pumps. |
Note: Normal operations of the engine and pumps are necessary for the pressure adjustments. 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, "Main Hydraulic Pump Air - Purge".
Caterpillar Information System:
302.5C Mini Hydraulic Excavator Hydraulic System Relief Valve (Main) - Test and Adjust
302.5C Mini Hydraulic Excavator Hydraulic System Relief Valve (Swing) - Test and Adjust
302.5C Mini Hydraulic Excavator Hydraulic System Relief Valve (Pilot) - Test and Adjust
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Hydraulic Lockout Control - Assemble
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Hydraulic Lockout Control - Disassemble
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Hydraulic Lockout Control - Install
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Hydraulic Lockout Control - Remove
365C Excavator Machine Systems Window Wiper Motor - Remove and Install
390D Excavator Machine Systems Storage Box and Covers (Cab) - Remove and Install
2005/08/15 Intake Valves are Sticking in Cold Climates {1100, 1105, 7620}
325C Excavator Engine Supplement Engine - Install
302.5C Mini Hydraulic Excavator Machine Systems Support (Swing Boom) - Install
302.5C Mini Hydraulic Excavator Hydraulic System Relief Valve (Line) - Test and Adjust
302.5C Mini Hydraulic Excavator Hydraulic System Swing Speed and Overswing on Level Ground - Check
302.5C Mini Hydraulic Excavator Hydraulic System Operational Checks
302.5C Mini Hydraulic Excavator Hydraulic System Main Hydraulic Pump Air - Purge
302.5C Mini Hydraulic Excavator Hydraulic System Machine Drift on a Slope - Check
302.5C Mini Hydraulic Excavator Hydraulic System Swing Speed and Swing Drift on a Slope - Check
303C CR and 303.5C CR Mini Hydraulic Excavators Hydraulic System Hydraulic System Pressure - Release
303C CR and 303.5C CR Mini Hydraulic Excavators Hydraulic System General Testing and Adjusting Information
302.5C Mini Hydraulic Excavator Hydraulic System Engine Performance - Test - Engine Speed
302.5C Mini Hydraulic Excavator Hydraulic System Travel on Level Ground - Test
302.5C Mini Hydraulic Excavator Hydraulic System Cylinder Speed - Check
303.5E2 CR, 304E2 CR, 305E2 CR and 305.5E2 CR Mini Hydraulic Excavators Machine System Visual Inspection