Magnum XR Series Service Instructions Manual page 26

When repairing or cleaning the pump, never submerge the pump in water or allow fluid to enter the pressure control.
Replace the pump as follows:
Disassembly
1. Thoroughly flush pump.
See Electric Shock Hazard on
page 7.
See Pressure Relief
Procedure on page 6.
2. Unplug electrical cord, and relieve pressure.
3. Remove suction tube assembly and drain tube.
4. Remove the four cover screws and front cover.
5. Remove yoke and guide rods.
6. Disconnect pressure control harness from control
board connector at back of drive housing. Using
fingernail or tip of small, flat-blade screwdriv-
er, press tab on right side of connector to
release.
7. Remove pump and the two mounting pins from
drive housing.
8. Place pump on workbench or in vise.
9. Remove pressure control switch from pump.
26 309044
Pump Replacement Kit
XR Pump Replacement Kit 243533
CAUTION
Installation
D Read all Installation Notes in service drawing on
facing page.
D To prevent misalignment, assemble sprayer tipped
onto back of enclosure.
1. Apply one or two drops of thread locking adhesive
(included in Kit 243533) to threads of pressure
control switch.
2. Screw pressure control switch into new pump, and
torque to 180 to 210 in-lb (20 to 24 NSm). Do not
overtighten, or damage could occur.
3. Remove gear, and use applicator brush to spread
entire contents of grease packet (included with Kit
243533) into gear teeth. Grease must be worked
into roots of gear teeth to ensure long life. Reinstall
gear.
4. Route pressure control harness behind pump
through retention clip, and connect to control board
connector at back of drive housing (connect with
tab to the right).
5. Install pump on mounting pins. Make sure the
plastic washers are between drive the housing
and the pump.
6. Install yoke with rod cap in slot of yoke, as shown
in Rod/Yoke Detail on facing page.
7. Check final assembly against Drive Train Detail
on facing page.
8. Install front cover and cover screws.