Covel No. 20 and 35 Surface Grinder Service Manual

Service manual for the Covel No. 20 and No. 35 precision surface grinders, essential documentation for technicians and operators maintaining these heavy-duty grinding machines. The manual provides detailed front, side, and rear views illustrating dust protection design, cooling vents, and robust construction throughout the machine frame. Documentation covers the sealed-for-life ball bearing spindle assembly, spindle motor mounting configurations, and the complete hydraulic system layout including closed circuit design with sealed tank and pump unit. The grinding wheel guard features a swivel mount for accessibility, while vertical ways cast integral with the base incorporate hand-scraped finishing and precision alignment with saddle ways for consistent accuracy. Telescoping guards protect vertical ways from dust ingress, and oil-tight, dust-tight push buttons ensure reliable electrical control operation in grinding shop environments. Table feed functionality includes both hand operation and power feed with interlock safety, adjustable table dogs for positioning, and speed control for optimal feed rates. The No. 35 model mounts a 12-inch grinding wheel driven by a 2 H.P. motor, while the No. 20 model uses a 10-inch wheel with 1.5 H.P. motor. All castings undergo semi-hard rough machining, normalization, and finish work for dimensional stability and long service life. Covel has manufactured precision grinding machines since 1874, bringing decades of engineering expertise to this workshop and repair manual resource.