ASTRO-PHYSICS German Equatorial 1200GTO Upgrade Vervanging

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Upgrade replacement of

1200GTO Polar Forks S1200PF-B

Although the installation of the new forks would seem to

be fairly obvious the weight of the RA Axis, location of

washers, awkwardness of position and gravity all add

complexity. We advise that you follow these instructions,

rather than "Wing it". This will assure that all of the

pieces are assembled back properly and will prevent

damage to the paint finish.

1-A

2-A

2-B

3-A

3-B

3-C

3-D

3-E

4-B

4-A

Step 1 - Remove the declination axis assembly,

GTO control box unit and any cables from the

mount. If your mount has the GTOCP1 control box,

you may elect to leave it attachted since it is more

difficult to remove than the GTOCP2 control box.

You may leave the right ascension assembly on

your pedestal, pier or tripod for most of the

upgrade. Have a table close by to set parts on.

Please note that the polar axis you will be removing

weighs approximately 36 pounds. Although not

mandatory, it would be best to have an assistant for

this upgrade.

Step 2 – Look at the interface between the polar

fork and right ascension housing. There are 4 flat

washers that will be dropping out as disassembly

takes place. Be aware of their location. All four are

the same size and thickness.

Step 3 – Using a ¼ inch hex key, remove the lock

knobs from both sides of the polar forks. The

washers resting between the forks and the housing

may fall out at this time. Be prepared to catch

them. If they do not drop out, release the torque on

the rear screws approximately one turn to release

them. (3-A) DO NOT remove the rear screws at

this time.

There is a possibility that the knob under the

worm drive bracket will hit the end of the cut out in

the bracket. (3-C) In this case the length of the

screw in the knob is slightly too long. Place a piece

of tape on the bracket to prevent scaring of the

parts.(3-D) Rotate the knob out until it hits the tape

and with a 1/4 inch hex key in the center screw, try

to "wiggle it free. If this does not work try the

following. Remove the set screw in the knob using

a 5/64 hex key. (3-E) Push into the set screw hole,

as deeply as possible a 1/8 inch hex key. Make a

cushion of cloth or paper and locate it under the

hex key and fork stiffener. Using a 1/4 inch hex

key attempt to break free the 5/16 socket head cap

Please gather the following tools

and materials to aid in the

replacement process.

¼ inch hex key

1 inch wide masking or electrical tape

Wood 2x4, maximum length 9 inches

Approximately 10) 3 ½ x 5 inch

pieces of single corrugation

cardboard

3/32 inch hex key

3/16 inch hex key

Table near telescope pier.

06/22/2004