35
If the nose pin is damaged while operating under high pressure, and the problem insists when the
pin is replaced, replace with a pin with larger cross section.
Close suction and discharge line of the pump before starting nose pin maintenance. Cut pressure
air inlet, and relieve the pressure in the pump. Drain the uid in the pump.
See pump installation diagrams. Remove four bolts by using a wrench or socket. Remove air inlet
cover and air inlet gasket. Pilot valve group can be removed for control and maintenance.
Check the nose pins. Refer to the gure. Nose pins can be accessed through the opening among
the pilot valve group. Remove the pins from the bushings on both sides of the pins. Check o-rings
for dirt, cut and wear. Replace the o-rings when necessary. Apply a thin layer of grease on each
o-ring, then place the pins on bushings. Push the pin forward. Pay attention that pilot valve ends
are adjusted between piston pins while reinstalling pilot valve group to intermediate space gap.
3 Main Body
11 Plunger, Actuator
19 O-Ring, For Pin
21 Bushing, Plunger
Actuator Plunger Maintenance
MIT 550
MIT 1500
MIT 4000 / MIT 5600 / MIT 8900
3
16
11
19
1 Main Body
2 Plunger, Actuator
3 O-Ring, For Pin
4 Bushing, Plunger
3
19
16
11
3 Main Body
19 Plunger, Actuator
16 O-Ring, For Pin
11 Bushing, Plunger
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