How to replace Intermatic clock motor

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2012

How to replace Intermatic clock motor

Replace clock motor

It is important to check the clock motor number before ordering
Intermatic boxes are universal, so any Intermatic timer can snap into the box, so the clock motor number can be different than model number that shows on timer box door

Release mechanism from box using thumb spring located inside top of box.

Replacement boxes and other Intermatic parts

Timer mechanism

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Pull out mechanism
clock motor is on back.

Look for model number.
Clock motors start with WG

Clock motor: model number

WG1573 240 volt consumes 3 watts of power

Identify clock motor number:
Clocks Motors and accessories/ pdf
Clock motors3 pdf

Buy Clock motors
at Aplus
at ESO
at TheFind
at Grainger
at Shopping.com
at ShopWiki
at Grainger

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Clock motor is held in place with 2 star-screws.
Image on left shows typical WH40 and T100 series timers

Remove 2 screws
Buy star screwdriver from auto parts store or hardware store.

Clock wires connect to terminals on front of timer
Make sure clock wires do not interfere with moving parts
Tighten all screws very tight

When attaching wires to Intermatic timer, do not put insulation under the screw-down plate
Do not use both solid and stranded wire or stranded wire will become loose
Take a photo of wiring before replacing timer

How to Troubleshoot Intermatic timer

Troubleshoot
Dial rotating	Manual override turns Load ON-OFF	Load turns ON-OFF	Action
Yes	Yes	Yes	No action, timer working
Yes	Yes	Yes with override only	Replace trippers, check that copper wire is attached tight to brass terminals
Yes, but not keeping time	Yes	Yes but not on time	Replace clock motor, check for loose wires, check for bad breaker, reset clock after power outage
Yes	Yes	Turns ON but not OFF -or- turns OFF but not ON	Replace trippers Intermatic trippers and parts
Yes	NO, but override snaps crisp-n-clean	NO	Check breaker and power to Load; check Load is working, test for voltage going to load
Yes but stops after tripper passes	Yes	Yes, until dial stops	Check Wiring. Line and Load wires are reversed. Line wires come from breaker. Load wires go to electrical device.
NO	Yes	Yes with override only	Replace clock motor
NO	NO, but override snaps crisp-n-clean	NO	Check wiring, check breaker and power to timer, check that copper wire is attached tight to brass terminals
NO	Override lever sluggish, or stuck and will not move	NO	Turn off power, spray WD-40 on lever and gears, replace clock motor, buy new timer
	Chart as pdf
		How to operate and set T104 timer How to wire Intermatic T100 series timers How to wire Intermatic T1905 and T1906 How to wire Intermatic WH40 and EH40 and EH10 How to wire several brands of box timers

Snap into old box

Buy mechanism and snap into existing box

Necessary only if gears are rusted and manual override lever does not snap crisp and clean.
New trippers and clock motor are cheaper

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Trippers Yellow dial rotates as time passes, and the Off and ON trippers push lever that causes timer to operate. Clock motor operates dial and will keep correct time for years. Image shows typical WH40 and T100 series Tripper identification numbers	156T1978A

See all Intermatic timers and manuals with wiring
How to wire Intermatic Timers

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Intermatic T8845PV

T8845PV larger image

Sprinkler timers
When planning watering times it is important to understand how the timer works. The timer just turns on-and-off, and each time the timer turns off, the sprinkler valve automatically advances to next zone. So the sprinkler valve is doing the mechanical job of advancing through each zone.

Rain sensor is not supplied with timer. Buy separate rain sensor. The rain sensor plugs into standard outlet. Connect the wires from rain sensor to terminals on timer. Do not apply voltage to rain sensor terminals.

T8845PV has 24Volt transformer with two yellow wires. Connect yellow wires to sprinkler solinoid. Connect 120Volt power to terminals marked Line and Neutral. Line is the black hot wire. Neutral is the white wire. Do not connect power to yellow wires.

Parts list and troubleshoot for sprinkler timers
How to wire sprinkler timers
How to set and troubleshoot sprinkler timers/ pdf

156T1950A

All brands of timers including Intermatic sprinkler:
With 120Volts, Line is the black hot wire. And Neutral is the white wire. Connect the black and white wires to terminals marked Line and Neutral.
With 240Volts, both wires from breaker are hot Line wires. L1 and L2. Either hot wire can connect to either terminal without regard to wire color.

Intermatic trippers and parts

Troubleshoot plug-in timers

Troubleshoot IntermaticMalibu power packs

Intermatic ST01C Intermatic EJ500	If lights blink, then timer is wired wrong. See wiring illustrations
Replace Intermatic timer batteries

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Intermatic trippers and parts	Dayton	Sprinkler timers	Power pack
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