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Mechanical and electrical problems

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12.2 Mechanical and electrical problems Table 5 Symptom Machine will not start/restart or repeatedly trips circuit breaker or blows fuses. Probable Cause No incoming power. Cord damaged. Band Saw frequently trips. Building circuit breaker trips or fuse blows. Overload automatic reset has not reset. Switch or motor failure (how to distinguish). Motor overheated. Motor failure. Miswiring of unit. Switch failure. Band Saw does not attain full speed. Extension cord too light or too long. Low current. * WARNING: Some corrections may require a qualified electrician. Correction * Verify machine connections. Replace cord. One cause of overloading trips which are not electrical in nature is too heavy a cut. The solution is to reduce feed pressure into the blade. If this does not resolve the issue, check for loose electrical lead. Verify that band saw is on a circuit of correct size. If circuit size is correct, there is probably a loose electrical lead. Check amp setting on motor starter. When the 3HP and 5HP Band Saw overloads on the circuit break built into the motor starter, it takes time for the machine to cool down before restart. Allow machine to adequately cool before attempting restart. If problem persists, check amp setting on the motor starter inside the electrical box. If you have access to a voltmeter, you can separate a starter failure from a motor failure by first, verifying incoming voltage at 115 +/-10% (or 230+/-10%) and second, checking the voltage between starter and motor at 115 +/-10% (or 230+/-10%). If incoming voltage is incorrect, you have a power supply problem. If voltage between starter and motor is incorrect, you have a starter problem. If voltage between starter and motor is correct, you have a motor problem. Clean motor of dust or debris to allow proper air circulation. Allow motor to cool down before restarting. If electric motor is suspect, you have two options: Have a qualified electrician test the motor for function or remove the motor and take it to a qualified electric motor repair shop for testing. Double check to confirm all electrical connections are correct. Refer to wiring diagram to make needed corrections. If the start/stop switch is suspect, you have two options: Have a qualified electrician test the switch for function, or purchase a new start/stop switch and establish if that was the problem on change-out. Replace with adequate size and length cord. Contact a qualified electrician. 29

Section	Page
JWBS-15, JWBS-18, JWBS-20	1
1.0 IMPORTANT SAFETY INSTRUCTIONS	2
2.0 Table of contents	4
3.0 About this manual	6
4.0 Specifications	6
4.1 Specifications for JWBS-15	7
4.2 Specifications for JWBS-18	8
4.3 Specifications for JWBS-20	9
4.4 Base Hole Centers	10
5.0 Setup and assembly	11
5.1 Shipping contents	11
5.2 Tools required for assembly	11
5.3 Unpacking and cleanup	11
5.4 Assembly	11
5.5 Handwheel	11
5.6 Installing and aligning table	11
5.7 Installing guide rail	12
5.8 Fence assembly and alignment	12
5.9 Table bracket (JWBS-20 only)	13
5.10 Miter gauge	13
6.0 Electrical connections	13
6.1 GROUNDING INSTRUCTIONS	13
6.2 Models JWBS-15, JWBS-18	13
6.3 Models JWBS-15-3, JWBS-18-3, JWBS-20-3, JWBS-20-5	14
6.4 Circuit Information (all models)	14
6.5 Extension cords	14
7.0 Adjustments	15
7.1 Aluminum resaw fence	15
7.2 Fence fine adjust	15
7.3 Table tilt	15
7.4 Adjusting 90-degree table stop	15
7.5 Leveling table insert	16
7.6 Installing/changing blades	16
7.7 Blade tension	17
7.8 Adjusting blade tension lever	17
7.9 Blade tracking	17
7.10 Overview – bearing adjustments	18
7.11 Upper blade guides	18
7.12 Upper thrust bearing	19
7.13 Lower blade guides	19
7.14 Guide post	20
7.15 Guide post parallelism	20
7.16 Changing blade speed	20
7.17 Drive belt replacement and tensioning	21
7.18 Pulley alignment	21
7.19 Brushes	21
8.0 Operating controls	21
8.1 Start/stop switch	21
9.0 Operation	22
9.1 General procedure	22
9.2 Ripping	22
9.3 Crosscutting	22
9.4 Resawing	23
9.5 Blade lead	23
9.6 Saw blade selection	23
9.7 Width	23
9.8 Pitch	23
9.9 Shape	24
9.10 Set	24
9.11 Material	24
9.12 Blade breakage	24
10.0 User-maintenance	25
11.0 Blade Selection Guide	26
12.0 Troubleshooting JWBS-series Band Saws	27
12.1 Operational problems	27
12.2 Mechanical and electrical problems	29
13.0 Replacement Parts	30
13.1.1 JWBS-15 Assembly – Exploded View	31
13.1.2 JWBS-15 Assembly – Parts List	33
13.2.1 JWBS-15 Rip Fence Assembly – Exploded View	36
13.2.2 JWBS-15 Rip Fence Assembly – Parts List	36
13.3.1 JWBS-15/18/20 Trunnion Support Bracket Assembly – Exploded View	37
13.3.2 JWBS-15/18/20 Trunnion Support Bracket Assembly – Parts List	38
13.4.1 JWBS-15 Guide Bar Bracket Assembly – Exploded View	39
13.4.2 JWBS-15 Guide Bar Bracket Assembly – Parts List	39
13.5.1 JWBS-15 Upper Wheel Assembly – Exploded View	40
13.5.2 JWBS-15 Upper Wheel Assembly – Parts List	40
13.6.1 JWBS-15 Lower Wheel Assembly – Exploded View	40
13.6.2 JWBS-15 Lower Wheel Assembly – Parts List	40
13.7.1 JWBS-15 Lower Blade Guide Assembly – Exploded View	41
13.7.2 JWBS-15 Lower Blade Guide Assembly – Parts List	41
13.8.1 JWBS-15 Upper Blade Guide Assembly – Exploded View	42
13.8.2 JWBS-15 Upper Blade Guide Assembly – Parts List	42
13.9.1 JWBS-15/18/20 Miter Gauge Assembly – Exploded View	43
13.9.2 JWBS-15/18/20 Miter Gauge Assembly – Parts List	43
13.10.1 JWBS-18 Bandsaw Assembly – Exploded View	44
13.10.2 JWBS-18 Bandsaw Assembly – Parts List	46
13.11.1 JWBS-18/20 Rip Fence Assembly – Exploded View	49
13.11.2 JWBS-18/20 Rip Fence Assembly – Parts List	49
13.12.1 JWBS-18/20 Guide Bar Bracket Assembly – Exploded View	50
13.12.2 JWBS-18/20 Guide Bar Bracket Assembly – Parts List	50
13.13.1 JWBS-18 Upper Wheel Assembly – Exploded View	51
13.13.2 JWBS-18 Upper Wheel Assembly – Parts List	51
13.14.1 JWBS-18 Lower Wheel Assembly – Exploded View	51
13.14.2 JWBS-18 Lower Wheel Assembly – Parts List	51
13.15.1 JWBS-18/20 Lower Blade Guide Assembly – Exploded View	52
13.15.2 JWBS-18/20 Lower Blade Guide Assembly – Parts List	52
13.16.1 JWBS-18/20 Upper Blade Guide Assembly – Exploded View	53
13.16.2 JWBS-18/20 Upper Blade Guide Assembly – Parts List	53
13.17.1 JWBS-20 Bandsaw Assembly – Exploded View	54
13.17.2 JWBS-20 Bandsaw Assembly – Parts List	56
13.18.1 JWBS-20 Upper Wheel Assembly – Exploded View	59
13.18.2 JWBS-20 Upper Wheel Assembly – Parts List	59
13.19.1 JWBS-20 Lower Wheel Assembly – Exploded View	59
13.19.2 JWBS-20 Lower Wheel Assembly – Parts List	59
13.20.1 JWBS-20 Upper Wheel Sliding Bracket Assembly – Exploded View	60
13.20.2 JWBS-20 Upper Wheel Sliding Bracket Assembly – Parts List	61
14.0 Electrical Connections	62
14.1 Connections for 1.75HP (models 714600, 714700)	62
14.2 Connections for 3HP (models 714650, 714750, 714800)	63
14.3 Connections for 5HP (model 714850)	64

Match case Limit results 1 per page

12.2

Mechanical and electrical problems

Table 5

Symptom

Probable Cause

Correction *

Machine will not

start/restart or

repeatedly trips circuit

breaker or blows

fuses.

No incoming power.

Verify machine connections.

Cord damaged.

Replace cord.

Band Saw frequently trips.

One cause of overloading trips which are

not electrical in nature is too heavy a cut.

The solution is to reduce feed pressure

into the blade. If this does not resolve the

issue, check for loose electrical lead.

Building circuit breaker trips or fuse

blows.

Verify that band saw is on a circuit of

correct size. If circuit size is correct,

there is probably a loose electrical lead.

Check amp setting on motor starter.

Overload automatic reset has not reset.

When the 3HP and 5HP Band Saw

overloads on the circuit break built into

the motor starter, it takes time for the

machine to cool down before restart.

Allow machine to adequately cool before

attempting restart. If problem persists,

check amp setting on the motor starter

inside the electrical box.

Switch or motor failure (how to

distinguish).

If you have access to a voltmeter, you

can separate a starter failure from a

motor failure by first, verifying incoming

voltage at 115 +/-10% (or 230+/-10%)

and

second,

checking

the

voltage

between starter and motor at 115 +/-10%

(or 230+/-10%). If incoming voltage is

incorrect, you have a power supply

problem. If voltage between starter and

motor is incorrect, you have a starter

problem. If voltage between starter and

motor is correct, you have a motor

problem.

Motor overheated.

Clean motor of dust or debris to allow

proper air circulation. Allow motor to cool

down before restarting.

Motor failure.

If electric motor is suspect, you have two

options: Have a qualified electrician test

the motor for function or remove the

motor and take it to a qualified electric

motor repair shop for testing.

Miswiring of unit.

Double check to confirm all electrical

connections are correct. Refer to wiring

diagram to make needed corrections.

Switch failure.

If the start/stop switch is suspect, you

have two options: Have a qualified

electrician test the switch for function, or

purchase a new start/stop switch and

establish if that was the problem on

change-out.

Band Saw does not

attain full speed.

Extension cord too light or too long.

Replace with adequate size and length

cord.

Low current.

Contact a qualified electrician.

WARNING:

Some corrections may require a qualified electrician.