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Maintenance
4. Maintenance
The maintenance procedures detailed in this section are to be performed by qualified personnel.
4.1. Timer assembly
The standard timer assembly consists of a ½ RPM (2 minutes per revolution) motor turning a common
shaft, which, in turn, rotates eight cams. As the cams rotate, they control various functions and the
sequence of the operational cycle.
The individual function of each of the 8 cams is identified by a label on the timer assembly. Cams 1
through 8 are positioned from left to right beginning with the “START” cam (cam 1).
HEATER
MOTOR
PAUSE
RINSESANI.FLUSHDRAINDET.START
*
Timer Assembly Label
*The “HEATER” label is not present if the optional sustainer heater is not installed on the machine.
Except for cams 1, and 3, all other cams can be user adjusted. The cam positions are all set at the
factory and only the cams controlling the chemical pumps (cams 2, 5 & 6) should ever need adjusting.
Each micro switch on the timer assembly is turned on and off by the cam its actuator rides on. For all of
the cams, except cams 1, 7 and 8, its corresponding switch is ON when its actuator is down in the cam
groove. (Cams 1, 7 and 8 are reverse acting and are turned ON when the micro switch actuator is up
out of the groove.) Opening the groove of any cam other than cams 1, 7 or 8 will increase the amount of
time that the micro switch is held ON. The cams are slip-fit and a cam adjustment wrench is provided (a
small screw driver or the edge of a table knife can also work to adjust the cams).
4.1.1. Cam Adjustment
The two sides of each cam connect to the shaft with a slip-fit so all cam adjustments are made
by rotating one side of the cam on the shaft to either increase or decrease the size of the cam
groove.
1. Turn off the circuit breaker providing power to the machine before pulling the control drawer
out to access the timer assembly.
Caution: One of the terminals on the main power switch remains “hot” even when the
machine’s main power switch is turned off—so turn the power off at the circuit breaker.
2. Remove the two 8–32 x ½” Screws securing the control drawer and slide it out to its fully
extended position.
3. Using the timer assembly label, determine which cam is to be adjusted. Double check by
counting over from cam 1 to the cam to be adjusted.
4. Determine which edge of the cam groove to be adjusted is the leading edge (contacts the
limit switch actuator first when the shaft is rotating) and which edge of the groove is the
trailing edge. The leading edge of the cam groove determines when in the cycle the control
action begins and should not be changed.
5. Adjust the trailing edge of the cam groove by rotating the appropriate side of the cam in the
proper direction to either increase or decrease the cam’s groove; resulting in increasing or
decreasing the total time that switch will be held ON.
MODEL L-1X & L-1X16 PARTS MANUAL Rev. 1.14 Page 10