FMC M12-HD, Руководство по эксплуатации и техническому обслуживанию, Страница: 9 / 20

F M C M 1 2 - H D O P E R A T I O N A N D M A I N T E N A N C E M A N U A L
9
Service Procedures
FMC pumps are designed to simplify all required maintenance. In addition to maintaining
clean crankcase oil at the proper level, the pistons, valves, and oil seals are all normal
expendable items that will eventually wear out and require replacement. Read and
understand each section completely before attempting to service the pump. This section
covers all normal service procedures on the fluid end of the pump. FMC drive ends do not
require routine maintenance and overhaul procedures may require special tools, equipment,
or training. If you suspect your pump requires drive end service, contact FMC or your
equipment OEM for assistance.
Replacing Piston Cup Seals
Pistons should be replaced whenever leakage increases to the point it becomes a steady
stream, not individual drops. For maximum uptime between service, FMC always
recommends that users replace all three pistons when service is required, not just the one
that shows signs of leakage.
•
Pump several gallons of clean water through the pump
before service to remove the majority of mud or polymer
from the fluid end components.
•
Bleed of all pressure inside pump fluid end. Shut valve on
inlet piping if provided to prevent flow of liquid into the
pump during service.
•
Remove cradle cover to expose the pistons and cylinder
liners. If a liner wash system is installed on your pump,
remove any piping or nozzles that might interfere with
removal of the piston cylinders.
•
Use a 3/8” socket wrench to remove the plunger clamp hex
bolts (59) and washers (58), then remove the plunger
clamp top (57) and bottom (56) from each of the three
pump cylinders.
•
Slowly rotate the pump crankshaft at least one complete
revolution. With the plunger clamps removed,
friction between the piston and liner will hold each
piston assembly in the full forward (or top dead
center) position and provide working clearance for
removal of the pistons.