Kawasaki K7SP36 OEM KAJ4955 hidraulikus szivattyú Case CX75SR CX80 kotrógép-hoz

TECHNICAL DATA SHEET: KAWASAKI K7SP36 HYDRAULIC PUMP

1. GENERAL IDENTIFICATION

Machine Models: Case CX75SR, Case CX80, Case CX80C

OEM Manufacturer: Kawasaki Precision Machinery (Japan)

OEM Model Series: K7SP36

Configuration: Variable Displacement Axial Piston Pump (Double Pump)

2. PERFORMANCE SPECIFICATIONS

Displacement (Main P1 & P2): $36.0$ $cm^3/rev \times 2$

Rated Operating Pressure: $29.4$ MPa ($4,264$ psi)

Maximum System Pressure: $34.3$ MPa ($4,975$ psi)

Rated Speed: $2000 - 2200$ RPM

Control System: Negative Flow Control (NFC) or Load Sensing (LS) depending on the Case control valve configuration. It typically features a sophisticated regulator to manage engine power distribution.

3. INTERNAL REPAIR COMPONENTS (ROTARY GROUP)

If you are performing a "Major Overhaul" on the K7SP36, these are the precision components required:

Cylinder Blocks (Barrels): Two rotating units that house the pistons.

Piston Set: 9 pistons per block (total 18). These must have a perfect "mirror" finish on the shoes.

Valve Plates (Port Plates): Critical for timing. Kawasaki valve plates are often "handed" (Left/Right specific).

Set Plate & Ball Guide: These components hold the piston shoes against the swash plate.

Swash Plate & Support (Cradle): The tilting mechanism that varies the flow.

Seal Kit: Includes high-pressure shaft seals and all static O-rings for the pump housing and regulator.

4. FACTORY CALIBRATION SETTINGS

Main Relief Pressure: $29.4$ MPa

Travel Boost Pressure: $34.3$ MPa

Pilot Control Pressure: $3.9$ MPa

Case Drain Pressure Limit: Should not exceed $0.1$ MPa ($14.5$ psi) to prevent shaft seal failure.

5. INSTALLATION & MAINTENANCE PROTOCOL

Case Priming: MANDATORY. You must fill the pump housing with at least 2.0 liters of clean hydraulic oil through the top-most drain port before starting the engine.

Air Bleeding: Loosen the air vent plug on the top of the pump housing. Wait until a steady stream of oil (no air bubbles) appears before tightening.

Filter Service: You must replace the Case genuine return filter and the pilot line filter. Clean the suction strainer in the tank.

System Flush: If the previous pump suffered an internal breakage, the oil cooler must be cleaned or replaced. Debris left in the cooler is the #1 cause of "new pump" failure.
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