I have had my Howard Miller clock since1988 and it has stopped . I can start the pendulum and it will swing for about five minutes and stop.

It is a handsome longcase clock and rather elaborate - it would be disappointing to discover the weights and pendulum are merely decorative.

I have only encountered one similar clock and it had one battery to keep the pendulum swinging and another to power the clock. The battery had to be fairly fresh or the pendulum stopped swinging. The clock also had to be level or the pendulum stopped.

If you took the picture when the pendulum was stationary, the clock appears not to be standing vertically. It is important they stand vertically in both planes to the nth degree.
There is also a fable about a clock never being happy standing next to or hanging on an exterior wall, sometimes not such a fable...

I don't think the pendulum is the problem. I suggest you should level the clock (considering the shape of the case a plumbline would be best), fit a new battery and give the pendulum a swing - if it doesn't keep swinging, there is probably a fault with the motor.

To restart your Marcel Hour Strike Quartz Clock NRMS603, follow these steps:

Stop the Pendulum: Gently stop the pendulum from swinging by holding it still.
Remove the Battery: Open the clock case and locate the battery compartment. Remove the existing battery.
Wait for a Minute: Leave the clock without a battery for about a minute to allow any residual charge to dissipate.
Insert a New Battery: Insert a fresh battery into the compartment, ensuring the correct polarity (usually marked on the battery holder).
Start the Pendulum: Gently release the pendulum and let it start swinging.
Set the Time: Use the clock's time-setting knob or buttons to adjust the time to the correct hour and minute.
Your clock should now be restarted and keeping time accurately

If you need to ask how to fix it, it probably means you shouldn't be tinkering with it.

You have something that represents a fair chunk of money and it would be wise to consult an experienced horologist about your problem or perhaps consult the manufacturer.

The cure might be as simple as removing the hands and putting them back to coincide with the chimes but it is presumably a fault that developed over time. I doubt the hands moved their relative positions by themselves but rather something inside happened.

Owning a mechanical pendulum clock is a hobby that requires some basic knowledge about how it works and how to care for it. The hands should never be turned backwards, for instance. Changing the time for daylight saving means either stopping the pendulum for an hour or advancing it by an hour and pausing at each quarter to allow the chimes to sound fully. Any mistakes will mean winding on many hours or stopping the clock and waiting.

OK, google is your friend, but before I go there, recognize that pendulum clocks are generally regulated by the speed/period of the pendulum. A shorter pendulum has a shorter period/faster time and vice versa. So in general, look for the length adjustment of the pendulum weight.
Specifically, here is a link to a google-d search:
http://www.howardmillerusa.com/customer-support/how-to-setup-howard-miller-grandfather-floor-clock.html

Hi Pam,
I have a Howard Miller Grandfather clock and the pendulum swings very slowly and from far left to far right travels only about three inches at best. It doesn't need to move any more than that to make the "Verge" move the "Escape Wheel" to rotate the gears to keep the hands moving at the correct tick.
Howard Miller Grandfather Clock

Hi Pam,
I have a Howard Miller Grandfather clock and the pendulum swings very slowly and from far left to far right travels only about three inches at best. It doesn't need to move any more than that to make the "Verge" move the "Escape Wheel" to rotate the gears to keep the hands moving at the correct tick. Howard Miller Grandfather Clock

You need to shorten the pendulum length.
http://usedclockparts.com/9-clock-case-repairs/31-how-to-speed-up-or-slow-down-your-clock-using-it-s-pendulum

First you have to wind up your clock using the key supplied. The pendulum suspension spring should start to swing quite fast. Stop it swinging with your fingers and hook up the pendulum. When done, push the pendulum to whatever side and release it to start the swing - the clock should start ticking in normal order. If there is no special bar on the back of clock movement for adjusting hands, then hands must be adjusted from the dial side by moving minute hand clockwise. Move the minute hand with your finger clockwise to the desired time, at the same time do not catch hour hand, as this may end up with the incorrect time displayed. Rate me, plz.

Give the pendulum a shove and do it every time you pass the clock. I got mine going from swinging for just 20 seconds to working permanently, at least until the next battery change.

On mine, the center one (@the 6 position) is the one that keeps the pendulum swinging. It is the one that lengthens the most during the week and if I forget to wind it, that pendulum is all the way down when the clock stops.