General 90-725 Manual Download Page 10

14

ADJUSTING BLADE TENSION

A properly tensioned blade is critical to obtaining maximum performance from any bandsaw. A properly ten-
sioned blade will last longer and be much less likely to break prematurely. 

If the blade tension is too loose you will notice that the blade will have a tendency to drift or slip off-line when 
cutting and you will have more difficulty controlling your cuts. A blade that is tensioned too tightly will break pre-
maturely. 

The following information can be used as a guideline or starting point to assist you in determining ideal blade ten-
sion. This bandsaw is equipped with a blade tension scale, which can be used as a reference for the ideal tension 
with various blade widths.

To adjust the blade tension

1

.   Lower the arm into the horizontal posi-

tion.

2

.   Turn the handle 

A

 clockwise to ten-

sion the blade or counterclockwise to 
loosen. The white mark 

B

 shoud be cen-

tered in the shaded zone 

C

 of the ten-

sion indicator.

3.

   Make a test cut on a sample piece and 

if needed, re-adjust the blade tension.

Note: To check the blade tension, apply gentle 
finger pressure on the blade side facing you. 
The blade should not move more than 0.004”.

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

A

C

A

B

MAKE SURE THE MACHINE HAS BEEN TURNED OFF AND UNPLUGGED FROM THE POWER SOURCE BEFORE PERFORM-
ING ANY MAINTENANCE OR ADJUSTMENTS.

ADJUSTING BLADE TRACKING

The upper wheel is aligned at the factory, but it may eventually be necessary to re-adjust the alignment after a 
long period of use or after maintenance. This potential misalignment can be corrected by adjusting the tilt of the 
upper wheel.

E

F

1. 

  Shut off the hydraulic downfeed control valve and 

lift the arm into the vertical position. Loosen lock 
knob 

D

 and slide the blade guard down as shown. 

Remove the two lock knobs 

E

 and open the blade 

cover.

2. 

  Loosen the two bolts 

F

 with a 14 mm wrench. 

D

Summary of Contents for 90-725

Page 1: ...t the blade has gained full operating speed before starting to cut 14 Always use a clean properly sharpened blade Dirty or dull blades are unsafe and can lead to accidents 15 Use suitable workpiece su...

Page 2: ...occurs contact a qualified technician or our service department CONVERTING THE MOTOR TO 240V Note When converting motor voltage on a machine that is equipped with a magnetic switch the switch contact...

Page 3: ...WITCH F COOLANT PUMP SWITCH G WHEELS 4 H BLADE I GEAR BOX J MOTOR K WORKPIECE STOP L COOLANT RECOVERY TRAY M STAND N CYLINDER O BLADE GUIDES 2 P RECOVERY TRAY FILTER Q CYLINDER VALVE R BLADE TENSION I...

Page 4: ...the unit features an automatic hydrauli cally controlled down feed with auto shutoff at the end of the cutting cycle The coolant system with built in pump is designed to supply a continuous ow of liq...

Page 5: ...r placement within your shop that will allow the operator to work unencumbered and unobstructed by foot traf c either passing shop visitors or other shop workers or other tools or machinery ESTABLISHI...

Page 6: ...e the workpiece stop onto the bar as shown G and tighten the thumbscrew H to secure it in place INSTALLING THE TABLE FOR VERTICAL CUTTING 1 To lock the blade arm in the UP position shut off the hydrau...

Page 7: ...utton twist lock out device C Once this button has been pressed the machine can only be started by turning the button to the right to release the stop button C The limit switch E on the end of the sta...

Page 8: ...nd refer to the chart in the electrical requirements section at the beginning of this manual 3 Overworked circuit caused by operating on a circuit that is close to its amperage draw capacity Make sure...

Page 9: ...nto the vertical position Loosen the lock knob A and then push the guard down as shown Remove the two lock knobs B and open the blade cover 2 Loosen the blade by turning the tensioning handle counterc...

Page 10: ...kwise to loosen The white mark B shoud be cen tered in the shaded zone C of the ten sion indicator 3 Make a test cut on a sample piece and if needed re adjust the blade tension Note To check the blade...

Page 11: ...is not square to the table go to step 2 2 Loosen screw D with a 6 mm Allen key and make sure that the blade is parallel with the square by turning the blade support E Retighten screw D once nished ad...

Page 12: ...rom side to side during the cutting and must be adjusted close to the blade but not touching the blade in order to ensure accurate cuts The space between each guide bearing and the blade must not exce...

Page 13: ...would not otherwise be supported from slipping out of po sition during cutting and to reduce risks of injuries a minimum amount of blade should be exposed For a straight cut and to reduce the risk of...

Page 14: ...and tighten bolt C a few turns 2 Repeat as needed until the desired tension is achieved and then retighten the jam nut B Note For less tension loosen bolt C SPEED SELECTION CHART BLADE SPEEDS BELT SP...

Page 15: ...ecommended parts and accessories The use of parts or accessories NOT recommended by GENERAL INTERNATIONAL may result in a risk of injury or damage to the machine 6 Be sure that adjusting wrenches tool...

Page 16: ...for any other unsafe conditions Clean the metal blade brush Monthly Inspect V belt tension damage or wear Clean the vise screw with compressed air and lubri cate as shown with an all purpose oil 1 Low...

Page 17: ...speed too high Reduce blade or speed feed Blade is too thick Replace with thinner blade Blade tension insuf cient Tension the blade Binding blade Reduce feed pressure Blade tension too high Reduce bla...

Page 18: ...rial Increase feed pressure by tighten ing the cylinder lock knob Blade twists Replace the blade and adjust its tension Insuf cient blade tension Tension the blade Blade slides Tension the blade BLADE...

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