32 · GLOBE RM410 PISTON AIR MOTOR MANUAL| INCLUDING AUXILIARIES | ATEX Certified
RM110
RM210
RM310
RM410
1.85 mm / 0.073 “
2.64 mm / 0.104”
3.24 mm / 0.128”
2.50 mm / 0.099”
2.03 mm / 0.080”
3.25 mm / 0.128”
3.66 mm / 0.144”
3.00 mm / 0.120”
2.34 mm / 0.092”
3.66 mm / 0.144”
4.06 mm / 0.160”
4.00 mm / 0.157”
2.64 mm / 0.104”
Measure dimension (A) from the crank washer face to the engine case and also dimension (B) from
the rotary valve face to the inside of the gasket. Select the correct shim washer from the list (31 - 34)
to obtain clearance. Rotate the crankshaft until the balance weight is at the bottom dead centre
position, rotate the rotary valve until the balance weight is at the bottom position. Assemble the valve
housing (3) on to the engine case (27). Rotate the output shaft in both directions and viewing the
rotary valve (2) through the exhaust cover (51) ensure that the valve is correctly following the output
shaft direction, this checks that both crank and valve slot are correctly engaged. Replace all drain
plugs and refill with oil. Spray some light oil into the inlet and exhaust ports and connect the unit to a
low pressure supply and allow the unit to run on the bench for a short period of time prior to refitting
the unit into full service.
Clearance Crank spacing Washers
Spacing RM110 - RM410
Fit spacing washer such that A - B = 0.25 to 0.50 mm (0.01” to 0.02”)
