622-333 and 622-137 are standard VDO 0–10 bar oil pressure sensors/switches, widely used in FG Wilson/Perkins generator sets, as well as excavators from manufacturers such as Caterpillar, Komatsu, and Sany.

I. Core Parameters and Positioning

Item Details | Models: 622-333, 622-137 (Interchangeable)

Brand / OEM: VDO (a Siemens subsidiary); OEM-fitted for FG Wilson/Perkins

Measurement Range: 0–10 bar (0–1.0 MPa)

Thread Specification: NPT 1/8 (Standard Installation) | Power Supply: 12V / 24V

Output: Analog signal (compatible with gauges/ECUs) + Low-pressure alarm contact

Protection Rating: IP67+; Oil-resistant, High-temperature resistant (-40°C to 125°C) | Weight: Approx. 200g

II. Compatible Equipment (High-Frequency Applications)

1. Generator Sets (Primary Application): • FG Wilson and Olympian full-series diesel generator sets • Perkins engines (400/1100/1200/2000 series) • Caterpillar CB series generator sets (CB22B/CB24B/CB32B)

2. Excavators / Construction Machinery (General Replacement): • Caterpillar 320D/323D/336D, Komatsu PC200, Sany SY series, etc. • Diesel-powered equipment such as wheel loaders, motor graders, and road rollers.

Note: The parameters for models 622-333 and 622-137 are identical, making them directly interchangeable. Other general-purpose models in this series include 622-331 and 10000-17461.

IV. Troubleshooting and Installation

Common Faults: Oil pressure alarms, no display on the gauge/instrument panel, engine protective shutdown.

Diagnostics: Check power supply (12V/24V), verify that signal output varies with pressure changes, and test the continuity of the alarm contact.

Installation: Wrap threads with PTFE tape (thread sealant tape); apply moderate tightening torque; ensure wiring harness is not pinched or exposed to water ingress.