Abstract: A cooling system mounting arrangement includes a platform of an article of construction machinery and an engine enclosure and a cab and cab riser mounted to the platform. The engine enclosure includes an engine and associated engine cooling system. The cab is mounted atop the cab riser, and the cab riser is adapted for ducting cooling air to an auxiliary cooling system disposed in the cab riser separate from the engine cooling system. The auxiliary cooling system includes a heat exchanger and a fan assembly for flowing cooling air across the heat exchanger. The fan assembly is movably mounted to the cab riser for movement between a first position adjacent to the heat exchanger for flowing cooling air across the heat exchanger and a second position spaced apart from the heat exchanger to permit access to the downstream side of the heat exchanger for cleaning and maintenance.

Abstract: A pressure control valve is connected to selectively supply a control pressure signal to shift a relief valve from a first low pressure mode to a second higher pressure mode and for simultaneously supplying the control pressure signal to an associated variable displacement pump for reducing the relatively high output of the pump to a relatively lower output.

Abstract: Operating parameters of an engine, such as coolant temperature, oil pressure, air filter flow and the like, are continuously monitored by an electrical circuit responsive to sensor switches. The circuit distinguishes between conditions which require immediate correction, such as low oil pressure for example, and conditions such as reduced porosity of the air filter which need not necessarily be corrected immediately but which should be attended to at the end of the current vehicle operation. The two types of conditions are signalled to the operator by different means and the signalling means for noncritical conditions remains latched on after the engine has been shut down to alert maintenance personnel to the need for corrections. Means are provided for selectively testing the system, for discriminating against nonsignificant, brief, actuations of a sensor switch and for selectively turning off signalling means which have been latched on.