International standards require that the axial centerline of the output shaft of the fuel injection pump test bench be offset from the vertical center plane of the T-slot of the table, with a tolerance of 0.04 mm over a length of 30 mm. The parallelism to the table is within a tolerance of 0.015 mm over a length of 30 mm. The distance tolerance to the work surface is 0.05mm, so the output shaft bearing housing (Fig. 1) directly affects the overall acceptance index of the test bench.
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