Do the clock mechanisms on these units fail? I

Troubleshoot timer:
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html

120Volt WG1570 clock motor might be going bad, and dial is hanging on tripper because motor is weak.
http://www.amazon.com/dp/B000GAV58K/?tag=waterheaterti-20
http://waterheatertimer.org/How-to-replace-Intermatic-clock-motor.html

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

99% chance the Timer wires are reversed ... and line from breaker and line to pump are reversed. Or remotely possibly the circuit is 240V, and somebody changed clock motor on old T101 from WG1570 to WG1573, converting old T101 into T102...
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101
Add a comment with what you discover

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link for 120Volt T101 timer wiring options:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Order 120 Volt WG1570 clock motor for T101
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html

You posted under Paragon 4001-00 120Volt SPST timer

1) If timer is not keeping correct time, generally you need to buy new clock motor.
However Paragon is no longer making timers and parts, except for defrost timers.
4001-00 is not defrost timer.
http://waterheatertimer.org/Paragon-timers-and-manuals.html#Paragon4000

2) You probably need to replace timer
Intermatic cross reference shows T101 timer is correct replacement.
http://www.intermatic.com/customer%20service/competitive%20cross%20reference.aspx

3) Amazon sells T101 for $43.
This price is a lot lower than trying to find somebody who has specific Paragon clock motor
http://www.amazon.com/Intermatic-T101-Hour-Dial-Timer/dp/B00002N5FN

4) Grainger and many other places sell T100 series replacement trippers and motors.
No worry about defunct product

5) Wiring for T101 appears below:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101

Cross-over wiring is as follows:
Paragon terminal 1 goes to T101 terminal 1
Paragon terminal 2 goes to T101 terminal 2
Paragon terminal 3 goes to T101 terminal A

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

If manual override works, then timer is basically sound.

1) If dial does not rotate, then replace clock motor: T104 timer uses 240Volt clock motor. T101 and T103 use 125Volt clock motor

2) If dial rotates, but trippers are missing or trippers are worn down and no longer click on-off lever, then buy new trippers.
T100 series trippers and clocks are shown following link:
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

3) If you have different timer than T101-103-104, then add a comment.

4) Clock motors are located on back of mechanism.
Mechanism snaps out with thumb spring located top inside box.
Clocks have identifying numbers: google search for that clock number if different that shown above.

5) If you buy new timer, then specify T104R.
R suffix is for raintight box.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

6) Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer or any do-it-yourself project.

Sounds like the clock motor has gotten weak.
You can replace Intermatic clock motors.

Snap out insides of timer and clock motor is located on back.
Motor has numbers printed on it that identify specific clock motor.

Motor is removable with small star screwdriver bit.
Clock motor has white wires that attach to terminals on front of mechanism.
Re-attach new clock to same terminals and tighten screws very tight.

If you have T101 or T103 timer, Grainger sells 125V clock for $16
If you have T104 timer, Grainger sells 208-277V clock for $16
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

You can google search your specific clock motor number:
Clock motors also appear on links below:
http://www.electricsupplyonline.com/prod/intermatic-motors.php
http://www.aplussupply.com/intermatic/timermotors.htm

Yes, the T101M 120Volt pool timer requires both ON and OFF trippers:

Grainger sells T100 series on-off trippers:
http://www.grainger.com/Grainger/INTERMATIC-Timer-Tripper-2E054?Pid=search
Amazon sells T100 trippers
http://www.amazon.com/dp/B003YO2C5U/?tag=picc-20

Grainger sells the T100 125V clock motor
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

How to wire T-101 120Volt timer
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101

How Intermatic dial timer clock works.
Clock motor rotates dial.
Intermatic clock motor, located on back of mechanism, are replaceable
Trippers located on outer edge of dial push on-off lever
ON tripper pushes lever one direction
OFF tripper pushes lever opposite direction.
Lever pushes electrical contacts together and pulls contacts apart.
When lever moves, manual override also clicks back and forth with audible click.
To replace timer, replacement snaps into box without needing to changing box.

You can replace clock motor on many Intermatic timers:
Snap mechanism loose using metal spring top inside box.
Tip mechanism out and get clock motor number off motor.
Google search specific clock motor number.

Aplus sells many clock motor:
http://www.aplussupply.com/intermatic/timermotors.htm
Electric supply online sells clock motors
http://www.electricsupplyonline.com/prod/intermatic-motors.php

Grainger carries inexpensive clock motors for T101, T103, T104 timers.
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi
T101 and T103 use 125v motor
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK1?Pid=search
T104 uses 240v motor
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK2?Pid=search

Buy new 125V clock motor
http://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=Wh40&op=search&Ntt=Wh40&N=0&sst=subset

Or buy new T101 timer and swap out insides without changing box