How to reinstall the pendulum on an Emporer grandfather clock.

I'm not positive about this, but I seem to recall that these type of clocks have two "silence levers" on the movement. These levers are located at the upper left and upper right corners of the movement as you face the movement from the back. The movement back panel has to be removed if it has one.

If the levers are pushed toward the chime rods, they will silence the hour or musical chime, depending on which one it is. I believe the silence levers are supposed to be moved away from the chime rods so the rods can retract and then strike the chime bars.

You have to adjust the bob on pendulum. If the clock is slow, the bob on the rod must be pushed up. If the clock is fast, the bob must be pushed down. Do adjustments bit by bit, day by day till the clock is keeping time. If all this does not work, you may need to replace suspension spring (if there is any). If there are no suspension spring, the clock may need proffessional attention.

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The clock must be levelled the same as when it was previously set up. In other words, if you didn't check the level of the clock before disassembly and reassembled it and re-levelled it, it may not operate because it might not be the same.
Some clocks have different weights for the clock, chime, and hour strike. Did you mark them and install them in the same location?
My Seth Thomas has a screw to adjust the swing of the pendulum to allow proper escapement on the gear, but you have to be able to determine which way the pendulum needs to swing more to make that adjustment. I may be able to help you with this!
You may need a clock repair service.
Let me know,

Most grandfather/grandmother clocks have an adjustable screw on the weight to slightly extend it or shorten it to satisfy the equation of pendulum swing. the shorter the swing (arc distance) the faster the clock, the longer the swing the longer the time. Check to see if you can adjust the weight up or down on the hanger.