Titan 550xc Owner'S Manual Download Page 19

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Before proceeding, follow the “Pressure Relief Procedure”
in the Operation section of this manual. Additionally,
follow all other warnings to reduce the risk of an injection
injury, injury from moving parts or electric shock. Always
unplug the sprayer before servicing!

Replacing the Gear

1. Remove the safety plate (43) and the front plate (44).
2. Remove the outlet mounting bolt from the rear of pump.
3. Remove the pump housing mounting screws (41) with a

3/16" allen wrench

4. With the fluid section attached to the pump housing (40),

pull the pump housing away from the gear housing (31).

5. Inspect the gears beginning with the crankshaft (37),

followed by the output pinion gear (33) and the pinion
gear (38).

6. Inspect the pinion gear on the armature assembly (see

the Motor Assembly parts list) by removing the motor as
described in the “Replacing the Armature” procedure.

7. Reassemble by reversing steps 1–6 above. When

reassembling, make sure that all washers are in place and
that gears and bearing are properly lubricated.

8. Grease the crankshaft (37) every 100 hours. The grease

fitting located under the front plate.

9. Grease the connecting rod in the fluid section every 100

hours. The grease fitting located on the connecting rod
under front plate.

Replacing the ON/OFF Switch

1. Remove the pressure control board and screws (54 and

55).

2. Disconnect the two black wires from the ON/OFF Switch

(49).

3. Remove the rubber boot (47) and the ON/OFF plate (48)

with a wrench.

4. Remove the ON/OFF Switch (49).
5. Install a new ON/OFF switch and reattach the ON/OFF

plate and the rubber boot. Tighten securely.

6. Reconnect the two black wires to the new ON/OFF

Switch.

7. Reinstall the pressure control board and screws, with the

warning label facing out.

Replacing the Power Cord

1. Remove the pressure control board and screws (55 and

56).

2. Disconnect the power cord (46) from the pressure control

board (54), the ON/OFF switch (49), and the grounding
screw (42). Refer to the electrical schematic.

3. Loosen the cord grip housing (45) and remove the power

cord.

4. Install the new power cord in reverse order of

disassembly.

5. Reinstall the pressure control board and screws with the

warning label facing out.

Replacing the Motor Brushes

1. Remove the brush plate (22).
2. Remover the brush insulator (23).
3. Remove the brush spring (25).

4. Back off screw. Hold the brush wire and remove the

motor brush (26).

5. Inspect the motor brush. If damaged, replace.

NOTE: To remove the brush spring, push the spring

down and in for it to release.

WARNING

6. Repeat this procedure for the other brush.
7. To reinstall the motor brushes, reverse steps 1–6 above.

Replacing the Pressure Switch

1. Remove the old pressure switch. Be sure all loose parts

are removed from the electrical box.

2. Install the transducer assembly (53) with o-rings in place.

Then, press the assembly securely into the filter block. It
is recommended that you replace the polyethylene gasket
that is between the pump and the filter block.

3. Reattach the filter block by guiding the transducer wires

through the bottom hole of the electrical box. Reinstall
the two original bolts that mount the filter block to the
pump. Be sure to tighten them evenly.

5. When installing the plastic potentiometer mount (56) from

the top of the electrical box, be sure the stop (raised
portion of the mount) is closest to the opening of the
electrical box. Square up the mount to the opening. Use
a rubber mallet to press the mount onto the pump, making
it flush. Use Loctite for mounting.

6. Put the potentiometer shaft (51) through the upper hole in

the electrical box, from the inside. The wires on the
potentiometer should come out of the box. Turn the
potentiometer clockwise or counterclockwise until it finds
the locating hole and stops turning. Install the seal tight
nut (29) onto the shaft of the potentiometer. Use needle
nose pliers to start the nut, and with a 1/2” socket 1/4”
drive, tighten to a torque of 4 in./lbs.

7. Turn the potentiometer shaft clockwise until it stops.
8. Loosen the nut on the pressure control knob (28), and

install onto the shaft of the potentiometer with the pointer
pointing away from the opening of the electrical box.

9. Hand tighten the nut onto the potentiometer knob and turn

the knob clockwise until it hits the stop. With a 5/16”
socket, tighten the nut onto the knob to 2 in./lbs. Install
the plastic potentiometer cap (27) onto the top of the knob.

Electrical Schematic

TRANSDUCER

700-197

POTENTIOMETER

700-158

PRESSURE

CONTROL

BOARD

440HP-- 700-161

447HPX -- 700-162

SWITCH

MOTOR