Lancaster LX15 Series, Installation, Operating And Service Manual

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Service Instructions

1) Drive Assembly

Disassembly and Inspection:

Remove the valve cover to access the drive assembly.

The drive brac  ket must be removed to access the drive cap assembly and the piston or the drive gear cover. It is not 

necessary to remove the PC board from the drive bracket to remove the drive bracket. Disconnect the power source plug 

(4 pin, black cable) from the PC board prior to disconnecting any other plugs from the PC board. Disconnect any MAV/

AUX drive motors (2 pin, black cable) from the PC board. Disconnect the water meter plug (3 pin, gray cable), located on 

the far right side of the PC board. The water meter plug (3 pin, gray wire) connects to the three-pin jack on the far right-

hand side of the PC board. Unweave the wires from the side holders. Two tabs on the top of the drive back plate hold the 

drive bracket in place. Simultaneously lift the two tabs and gently ease the top of the drive bracket towards your body. The 

lower edge of the drive bracket has two notches that rest on the drive back plate. Lift up and outward on the drive bracket 

to disengage the notches.

To inspect the drive reduction gears, the drive gear cover needs to be removed. The drive gear cover is held in place on 

the drive bracket by three clips. The largest of the three clips is always orientated to the bottom of the drive bracket. With 

the PC board facing up, push in and down on the largest clip on the drive gear cover. Handle the cover and gears carefully 

so that the gears do not fall off of the pegs in the cover. Replace broken or damaged drive gears. Do not lubricate any of 

the gears. Avoid getting any foreign matter on the reflective coating because dirt or oils may interfere with pulse counting.

The drive bracket does not need to be removed from the drive plate if the motor needs to be removed. To remove the 

motor,disconnect the power and motor plugs from the jacks on the PC board. Move the spring clip loop to the right and 

hold. Rotate the motor at least a ¼ turn in either direction before gently pulling on the wire connectors to remove the 

motor. Pulling directly on the wires without rotating the motor may break the wires off the motor. Visually inspect the 

motor for free spinning and remaining brush life (visible through slots on the side of the motor). Check the pinion gear for 

endplay. If the pinion gear is pushed tight against the motor housing, eliminating endplay, slide it away from the housing 

so the end of the shaft is flush with the end of the gear.

The PC board can be removed separately from the drive bracket but it is not recommended. Do not attempt to remove the 

display panel from the PC board. Handle the board by the edges. To remove the PC board from the drive bracket, unplug 

the power, water meter and motor plugs from the PC board. Lift the middle latch along the top of the drive bracket while 

pulling outward on the top of the PC board. The drive bracket has two plastic pins that fit into the holes on the lower edge 

of the PC board. Once the PC board is tilted about 45° from the drive bracket it can be lifted off of these pins. To reinstall 

the PC board, position the lower edge of the PC board so that the holes in the PC board line up with the plastic pins. Push 

the top of the PC board towards the valve until it snaps under the middle latch, weave the power and the water meter 

wires into the holders and reconnect the motor, water meter and power plugs. 

Reassembly:

If the drive gear cover was removed, reinstall it with the large clip orientated towards the bottom. If all three clips are 

outside of the gear shroud on the drive bracket the drive gear cover slips easily into place

To reinstall the drive bracket, seat the bottom of the drive bracket so the notches are engaged at the bottom of the drive 

back plate. Push the top of the drive bracket towards the two latches. The drive bracket may have to be lifted slightly to 

let the threaded piston rod pass through the hole in the drive bracket. Maintain a slight engaging force on top of the drive 

bracket while deflecting the bracket slightly to the left by pressing on the side of the upper right corner. This helps the drive 

gears mesh with the drive cap assembly. The drive bracket is properly seated when it snaps under the latches on the drive 

back plate. If resistance is felt before latching, then notches are not fully engaged, the piston rod is not in hole, the wires 

are jammed between the drive bracket and drive back plate, or the gear is not engaging the drive cap assembly.