Case CX350B, CX370B Crawler Excavator Service Manual

Description

Table of Contents

1. General Information
2. Engine
3. Fuel System
4. Electrical systems
5. Undercarriage
6. Drive Train
7. Upper structure Hydraulics
8. Upper structure
9. Hydraulic Schematics
10. Electrical Schematics

Manual Extract: Pressure Boost Control

1) During upper operation (upper pressure sensor = ON), the next time the high-load conditions are met, the boost solenoid valve on the 5 stack solenoid valve comes ON, and the main relief valve pressure rises from 34.3 MPa (343 bar / 4975 psi) to 36.8 MPa (369 bar / 5337 psi).
Conditions:
When the engine load ratio rises and the P1 or P2 pump pressure is boosted.

2) Auto power boost (ended by time restriction)
When the work mode is SP or H, the boost continues a maximum of 8 seconds, then is automatically ended (boost solenoid = OFF). When the work mode is A, this time restriction is eliminated and the pressure boost is always available.

3) Auto power boost (ended by operation stop)
Even before the time limit for auto power boost, if the upper pressure sensor goes OFF, the boost is ended.

4) Boost prohibition
During travel (travel pressure sensor = ON) or the breaker is in use