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An obvious problem that can occur is for the timer motor to fail. The motors turn at 1 rpm, so it is quite easy to tell if it is turning. A more common problem is for one or more of the drive gears to strip. Removing the Tripper Arm screw, the Skipper Wheel screw and the three cover plate screws will gain you complete access to all components for careful examination. It is easier to work on your timer housing if you remove it from the valve body. Pull out the timer retaining pin ( 5F ), slide power cord out of it's retaining slot, unscrew Cam Shaft Bearing at rear of Cam Shaft, and then pull housing straight up.

Common Gears that Fail
1. TRIPPER ARM WHEEL # 99F ( 1031756 )*Most Common Gear to break at the 2-3am. Position
2. # 7 BLACK GEAR # 420A43 ( 1031554 ) *Gear that drives the Tripper Arm Gear, and often strips out at the same times as the Tripper Arm Gear breaks.
3. Red Knob Gear # 106H ( 1001582 ) * now "Black" closely examine the "over hang" teeth of the OUT PUT GEAR, as they sometimes snap off.
4. #8 BLACK GEAR # 420A44 ( 1030844 ) *Drives the Out Put Gear, and if stripped you can easily see this.

Also the "OUT PUT CONNECTOR" # 21E ( 1031496 ) or ( for newer 440i and 460i cases, the 1001833 ), which attaches to and drives the Cam Shaft can crack or break.
On rare occasions the CAMSHAFT # 21F-3 ( 1031950 ) will break at one end.
Also, rare is a cracked SKIPPER WHEEL # 14F-6 ( 1031740 ).Close examination of both sides of the Skipper Wheel is required to detect this failure.
And last, but not least, you can have a gear post break in the housing body it's self. But only the back plates for the 440i version is available and not the "box" used with the older 440 version. It is simpler and prudent to replace the Complete Timer Assembly ( with the new 460TC ) at this point.

A complete replacement is recommended if the unit is over 20 years old.

The newest replacement timer is the 460TC ( runs on 12 volts AC using transformer 1000811 ... same transformer used with 440i models ),
see:The 460TC replaces all previous 440 Timer Assemblies.


And now available for Models 255,263 and 268 is the Logix 740 upgrade timer kit ( does NOT work with the older 155, 163, or 168 valves... sorry ).

See for 255 valves: UPGRADE KIT 255/740 LOGIX ELECTRONIC REPLACING 440 SERIES TIMER

Or Performa 263, 268: UPGRADE KIT PERFORMA 740 LOGIX ELECTRONIC REPLACING 440I SERIES TIMER

460TC or Logix 740 - Which Timer Replacement is Best?







460TC Replacement Timer Assembly for 440 series Upgrade Kit 255/740 Logix Electronic replacing 440i series timer Upgrade Kit Performa 740 Logix Electronic replacing 440i series timer

460TC Replacement 7 DAY Timer Assembly for 440 series, with 12 volt 60 Hz AC Transformer

Upgrade Kit 255/740 Logix Electronic replacing 440i and 440iHV series timer Retrofit 440i timer with the 740 Logix Electronic Control Day Timer Assembly used on the Autotrol 263 and 268 Performa Valve.
Camshaft Out Put Connector Autotrol 21E or 1031496 Gear  Tripper Arm Assembly 99F Gear - # 7 Black 420A43 - 1031554
Gear Tripper Arm Assembly 99F
IN STOCK
Your Price: $14.95
Gear - # 7 Black 420A43 - 1031554
IN STOCK
Our Price: $4.99
Now Obsolete Part, NONE IN STOCK
21E Output Connector used to connect to CamShaft on the 440 & 460 Timer Assembly.
Used on all 155, 163, 168, 255 timer assemblies. Part Number 21E or 1031496.
OPTION:
Newer Version used in the 440i, 460TC and 460i is slightly different one, AP1001833,
and can be used as a replacement ( shave off "arrow" on the AP1001833, and no C-clip used, but it will still "stay" in place when 440 is re-assembled to provide turning of the Camshaft ).

Recommendation = Complete timer replacement option is the AP460TC.

99F Tripper Arm and Gear for Autotrol 440 and 440i Timer Assemblies.

Black Drive Gear # 7, 420A43.
This gear drives the Tripper Arm Gear ( 99F ).
Gear - # 8 Black 420A44 - 1030844 Gear - Red or Black Output 440 Timer - 420B52, 1001583 Gear 420A42 White Old 440 Timers AP420A42
Gear - # 8 Black 420A44 - 1030844
IN STOCK
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Gear 420A42 White Old 440 Timers AP420A42
Usually Ships in 1 to 2 Days
Your Price: $9.95

Black Drive Gear # 8 .
This Gear Drives the large Red or Black Output Knob Gear.

Red Output Gear for 440 and 440i Timer assembly used on some Autotrol 155, 1550-TC, 163, 168, 255, 263, 268.
Very old PN was 420B52.
NEW COLOR IS BLACK for this Gear ( newer PN in some manuals 1001583 ).
Identical to older Red version.

White Gear 420A42 for Autotrol 440 and 440i Timer Assemblies.Used in older version, and not the 440iHV Revised version.

Limit amount in stock, as this is an obsolete item.

Gear Tripper Arm 6 Day REVISED PN 3007499 REVISED 7 Day Tripper Arm and Gear for REVISED Autotrol 440iHV Timer Assemblies made since January 2008. Motor - Timer 115v 98F-1 or 1030846 or 1000376
Gear Tripper Arm 6 Day REVISED PN 3007499
OBSOLETE
REVISED 7 Day Tripper Arm and Gear for REVISED Autotrol 440iHV Timer Assemblies made since January 2008. 98F-1, 1030846,  1000376, and 420A56, are all part numbers for this 115 V, 60 Hz, 1 RPM Timer motor used in 440 Timer assemblies.
Six Day Skipper Wheel, 14F6, 1031740 Skipper Wheel 6 Day REVISED PN 3007523 Skipper Wheel 7 Day
Six Day Skipper Wheel 14F-6 or 1031740
IN STOCK
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Skipper Wheel 6 Day REVISED PN 3007523
IN STOCK
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Six Day Skipper Wheel

Skipper Wheel 6 Day REVISED PN 3007523 Seven Day Skipper Wheel ( 14F-7 or 1031742 ) used on Autotrol 440 and 440i Timers
OBSOLETE part - None as of May 2019.
Skipper Wheel 7 Day REVISED PN 3007524 Transformer 120v/60hz to 12vac - 1000811
Skipper Wheel 7 Day REVISED PN 3007524
IN STOCK
Our Price: $11.95
Skipper Wheel 7 Day REVISED PN 3007524 Transformer 120v/60hz to 12vac 60 hz used with many Autotrol valves in the U.S.A.
PN 1000811 and PN 3019151 and newest PN 44149