Official service manual for Kohler CH620‑CH750 engines with safety, maintenance, specifications, and troubleshooting instructions.
This service manual provides comprehensive safety precautions, maintenance schedules, and detailed specifications for Kohler CH620‑CH750 series engines. It includes torque values, clearance limits, oil and fuel recommendations, and step‑by‑step service procedures.
The document also covers system‑specific sections such as air cleaner, fuel system, governor, lubrication, electrical, starter, and clutch, plus tools and aids needed for proper repair and reassembly.
| Bore | 77 mm (3.03 in.) |
|---|---|
| Stroke | 67 mm (2.64 in.) |
| Displacement | 624 cc (38 cu. in.) |
| Oil Capacity (refill) | 1.6‑1.8 L (1.7‑1.9 U.S. qt.) |
| Cylinder head fastener torque | 16.9 N·m (150 in‑lb) first, 33.9 N·m (300 in‑lb) final |
Before working on the engine, disconnect the spark plug leads and disconnect the negative battery cable to prevent accidental starts.
The cylinder head fastener should be tightened to 16.9 N·m (150 in‑lb) first, then to a final torque of 33.9 N·m (300 in‑lb).