Abstract: When an engine stall is likely to occur, the pressure of the back pressure chamber of a relief pressure valve is released to adjust the relief pressure of the relief pressure valve. This actuates a pressure compensating circuit to release the pressure in a control circuit to an oil tank. Thus, a rapid increase of the pressure due to a cargo handling operation is restricted, and an engine stall due to insufficient torque of the engine is avoided.

Abstract: When an engine stall is likely to occur, the pressure of the back pressure chamber of a relief pressure valve is released to adjust the relief pressure of the relief pressure valve. This actuates a pressure compensating circuit to release the pressure in a control circuit to an oil tank. Thus, a rapid increase of the pressure due to a cargo handling operation is restricted, and an engine stall due to insufficient torque of the engine is avoided.

Abstract: A mast assembly for a forklift truck includes an outer mast, an inner mast and a lift bracket. The outer mast includes a pair of substantially vertical outer mast rails and a substantially horizontal first outer mast beam. The first outer mast beam is connected to the outer mast rails by means of bolt connection. The inner mast vertically movably connected to the outer mast via mast rollers and includes a pair of substantially vertical inner mast rails and a substantially horizontal inner mast beam. The inner mast beam is connected to the inner mast rails by means of bolt connection. The lift bracket is connected to the inner mast via lift rollers.