Drill Press 3z919d Manual

Working With the Drill Press 3z919d Manual

I've spent more time than I care to admit wrestling with this machine's documentation. The 3Z919D is a solid 3-speed benchtop drill press, 17-inch swing, 1/2-chuck capacity, typically sold under the JET brand. The manual itself is a decent 32-page PDF that covers assembly, belt changes, quill adjustment, and basic maintenance. It is not comprehensive, but it gets you far enough to keep running the thing without destroying it. The first thing most people miss is that the quill return spring tension is not factory-set for all conditions. When I first brought one of these online, the quill would not fully retract after drilling a through-hole in 3/4-inch plate. The manual says "adjust spring tension" on page 14, but does not specify how much. The fix was loosening the nut on the spring retainer at the top of the quill housing, compressing the spring about two full turns, and re-tightening. That gave the quill enough downward force to close reliably without making the chuck lever feel like it was fighting you the entire stroke. If you over-tighten it, you will strip the quill bearings within six months.

Download the Drill Press 3z919d Manual

The official PDF lives on the JET Tools website under their product documentation section, usually at jettools.com/support. Search for model 3Z919D and download the "Operator's Manual" PDF. It is roughly 2.1 MB. If you cannot find it there, manualsonline.com and manualslib.com both have clean scans uploaded. The one on manualslib is slightly more readable since it is the original scan rather than a compressed re-upload, but both contain the same content. There is one specific page in the manual that is essentially useless without context: the belt routing diagram on page 8. It shows the three pulley positions but does not indicate which belt corresponds to which speed range. I learned this the hard way after removing the guard to swap belts and putting the wrong one back on, which immediately caused a burning rubber smell and a complete loss of torque on the low setting. The correct configuration is: low speed uses the larger pulley on the motor and the smaller pulley on the spindle (belt sits on the outer grooves of both). High speed reverses that. Medium sits in the middle groove pair. When in doubt, trace the belt path from the motor pulley upward to the spindle — if the belt is crossing itself, you have it wrong. Another section the manual handles poorly is the table trunnion adjustment. The 3Z919D tilts 45 degrees left and right. The manual tells you to loosen two bolts, tilt, and retighten. What it does not tell you is that those bolts require about 45 foot-pounds of torque to hold the table firmly under load. If you tighten them by feel with a standard socket wrench, the table will drift during heavy angled drilling. I ended up using a small torque wrench set to 45 lb-ft and marked the bolt heads with paint pen so I could verify they were seated consistently. The table has been stable ever since.

The spindle bearing specification is listed as 6205-2RS on the bottom of the quill assembly. That is a standard sealed ball bearing you can buy anywhere for about eight dollars. The upper bearing is a 6202-2RS. Neither is a specialty part. If the quill feels gritty when you rotate it by hand with the chuck removed, replacing both bearings is a 40-minute job. You will need a bearing puller, a drift punch for the taper, and a new pack of Lithium NLGI #2 grease. Do not use automotive wheel bearing grease — it breaks down at the temperatures a drill press spindle generates during sustained use. The chuck key storage magnet on the side of the column is useless after about two years. The magnet loses its pull and the key falls into the work area. I solved this by wrapping a small O-ring around the key and storing it on the spindle guard hinge pin. It is an unofficial fix that works better than the original design. One limitation of the 3Z919D that the manual does not emphasize: the 1/2-inch chuck capacity is theoretical maximum under ideal conditions. Drilling 1/2-inch holes in steel with HSS bits consistently will cause noticeable runout and premature bit wear. The spec holds up fine for 3/8-inch max in steel and 1/2-inch in hardwood. If you regularly need to drill larger than 3/8-inch in metal, the Z-bored quill and lighter column mass of this benchtop model make it the wrong tool for the job. Look at a floor-model 15-series instead.

The motor is a 3/4-horsepower, 110-volt, single-phase induction motor with a 4.7-amp draw. It runs cool under normal loads. If it trips your breaker on startup, check the belt tension first — an overtightened belt creates enough drag to prevent the motor from reaching operating speed. The manual recommends approximately 1/4 inch of deflection at the midpoint between the two pulleys when you press firmly with your thumb. That is the sweet spot. Anything tighter and you are crushing the motor bearings for no gain. For anyone who owns this machine, having the manual on hand matters more when something goes wrong than when you are just setting it up. The wiring diagram on page 28 is particularly important if the on/off switch stops responding. I had one where the switch worked intermittently because the spade connector on the green ground wire had worked itself loose inside the terminal block. The manual shows the correct terminal layout but does not mention that the ground wire connection is prone to vibration loosening over time. I resolved it by adding a small lock washer under the terminal screw and a wrap of electrical tape around the spade connector before reinserting it. That has held for three years. The maintenance schedule outlined in the manual calls for greasing the quill way every six months and inspecting the belt condition annually. I would suggest greasing the quill way every three months if you are running the machine daily in a shop environment. Sawdust and metal chips accumulate in the quill housing faster than the manual accounts for, and that debris mixes with the grease to form an abrasive paste that accelerates bearing wear. A simple spray of compressed air through the quill clearance between the housing and the sleeve will clear most of it before it causes damage.