Specifications
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330F MHPU Mobile Hydraulic Power Unit Machine System
[M0067808]
330F MHPU Mobile Hydraulic Power Unit Machine System
Gear Pump (Pilot) - Test
330F MHPU Mobile Hydraulic Power Unit Machine System
System Pressure - Release
HYDRAULIC SYSTEM
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Visual Inspection
330F MHPU Mobile Hydraulic Power Unit Machine System
Solenoid Valve (Proportional Reducing) - Calibrate - Boom Down Regeneration
330F MHPU Mobile Hydraulic Power Unit Machine System
Solenoid Valve (Proportional Reducing) - Calibrate - Power Shift Pressure
330F MHPU Mobile Hydraulic Power Unit Machine System
Solenoid Valve (Proportional Reducing) - Calibrate - Negative Flow Control
330F MHPU Mobile Hydraulic Power Unit Machine System
Power Shift Pressure - Check
330F MHPU Mobile Hydraulic Power Unit Machine System
Specifications
330F MHPU Mobile Hydraulic Power Unit Machine System
System Pressure - Release
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Illustration 1 | g06058318 |
Relief valve locations (1) Main relief valve (2) Boom cylinder line (head end) (3) Boom cylinder line (rod end) (4) Stick cylinder line (head end) (5) Stick cylinder line (rod end) (6) Bucket cylinder line (head end) (7) Bucket cylinder line (rod end) (8) Swing (right) (9) Swing (left) (10) Pilot relief valve (11) Main control valve (12) Pilot filter (13) Swing motor |
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Relief Valve | Specifications | Torque for Locknut | ||
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New
Rebuilt(1) |
Service Limit(2) | |||
Main relief valve | |
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(Heavy Lift) |
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Boom cylinder line (head end) | |
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Boom cylinder line (rod end) | |
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Stick cylinder line (head end) | ||||
Stick cylinder line (rod end) | |
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Bucket cylinder line (head end) | |
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Bucket cylinder line (rod end) | ||||
Swing relief pressure (right) 334-9971 Swing Motor Gp | |
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Swing relief pressure (left) 334-9971 Swing Motor Gp | ||||
Swing relief pressure (right) 482-6394 Swing Motor Gp | |
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Swing relief pressure (left) 482-6394 Swing Motor Gp | ||||
Pilot relief valve | |
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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 the following problems: improper adjustment, wear, damage of relief valves and damage of pumps. |
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Relief Valves | Pressure change With One Turn Of Adjustment Screw |
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Main valves | |
Swing relief valve | |
Pilot relief valve | |
Note: Pressure values in Table 2 are approximate values. Use a pressure gauge for adjustment.
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 check the engine and the pump characteristic curve. 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".
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330F MHPU Mobile Hydraulic Power Unit Machine System
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