Jet GHD-20 - Manual

8 Adjusting the Head Height To facilitate shipping, the Drill Press is packed with the head adjusted down on the column. The head assembly should be moved to the top of the column before drilling operation starts. The head assembly is very heavy. Use caution when adjusting the head and make sure it ...

9 Controls Low/Off/High Switch (A, Figure 8) – located top left side of the head assembly. Switch between low and high speed range. In the stop position, the spindle is stopped, but the machine still has power. Fine Feed Handwheel (B, Figure 8) – located on the front lower right of the head assembly...

10 Control Panel for GHD-20T/20PFT Low/Off/High Switch (A, Figure 9A) Switch between low and high speed range. In the stop position, the spindle is stopped, but the machine still has power. Drilling Tapping Selector (B, Figure 9A) For drilling, press the start switch (F, Figure 9A) to run the machin...

11 Adjustments Installing a Drill Chuck (not included) 1. Disconnect the machine from the power source. 2. Clean the arbor and the inside of the chuck. The tapers must be clean and dry. 3. Push the chuck onto the arbor. 4. Retract the chuck jaws completely, and push the arbor into the spindle. 5. Us...

12 Adjusting the Depth Stop for Drilling (GHD-20PF) 1. Loosen the depth stop lock handle (A, Figure 12). 2. Manually advance the quill to the desired depth with one hand. 3. With the other hand, turn the depth stop scale (B, Figure 12) counter-clockwise to zero. 4. Tighten the depth stop lock handle...

13 Return Spring Adjustment The return spring is adjusted at the factory and should not need further adjustment. If adjustment ever becomes necessary: 1. Unplug the machine from the power source. 2. Loosen lock knob (A, Figure 14) while holding the quill spring cover. Do not allow the cover to turn ...

14 Changing the Gear Box Lubricant 1. Disconnect the machine from the power source. 2. Loosen nuts (A, Figure 17). 3. Tilt the head to access the drain plug. The drain plug is found in the head cavity behind the spindle. 4. Loosen the drain plug but do not remove. 5. Return the head to upright posit...

15 Troubleshooting Trouble Probable Cause Remedy Excessive vibration. Motor out of balance. Balance motor or replace. Noisy Operation. Improper quill adjustment. Adjust quill. Dry spindle. Lubricate spindle. See the Lubrication section. Noisy motor Check motor bearings or for a loose motor fan. Moto...

16 Replacement Parts Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-800-274-6848, Monday through Friday (see our website for business hours, www.jettools.com). Having the Model Number and Serial Number of your machine available when you ca...

18 Parts List – GHD-20PF/20PFT Head Assembly Index No. Part No. Description Size Qty 40 .............. GHD20PF-40 ............ Screw ....................................................................... 3/16” x 3/8” .................... 1 42 .............. 61105 ........................ Spring Bas...

25 Parts List – Gear Assembly GHD-20PF, 20PFT Index No. Part No. Description Size Qty 1….…... …2401001-2 .................. Main Shaft Cover ..................................................... ...................................... 1 2 ................ GHD20-28 ................. Oil Seal ............

31 Parts List – Control Box Assembly Index No. Part No. Description Size Qty 401 ............ GHD20PFT-401…....... Control Box ............................................................ ...................................... 1 .................. GHD20PFT-CB ........... Control Box Complete (GHD-20...