VT Service Manual -D Series Models: VT-751D, VT-752D
VT-751D and VT-752D WARNING: Disconnect heat gun power cord and allow the heat gun to cool before disassembly. READ THE SERVICE INSTRUCTIONS CAREFULLY. FAILURE TO EXACTLY FOLLOW THE INSTRUCTIONS COULD RESULT IN PERSONAL INJURY OR DAMAGE TO YOUR HEAT GUN. ALL REPAIRS MUST BE PERFORMED BY A QUALIFIED REPAIR TECHNICIAN. AVERTISSEMENT : Débrancher le cordon du pistolet thermique et laisser celui-ci refroidir avant de le démonter. LIRE ATTENTIVEMENT LES INSTRUCTIONS D’ENTRETIEN.
VT-751D and VT-752D Figure 1 COVER BLOWER WHEEL Ⓛ MOTOR SCREWS (2) HANDLE, LEFT MOTOR ELEMENT CONNECTOR SHRINK TUBE SHRINK TUBE Ⓣ CIRCUIT BOARD, KIT #30093 FOR VT-750D, (120V) KIT #30094 FOR VT-752D, (220-240V) GROUND SCREW, GREEN CORDSET SCREWS (2) Ⓜ #6-32 SCREW (2) Ⓜ ELEMENT Ⓥ NOZZLE SCREWS, (2) Ⓦ CABLE GUARD ELECTRICAL BARRIER HOUSING, METAL NOZZLE AND SHIELD HOUSING Ⓗ SCREWS (2) Ⓗ Ⓗ Figure 2 Ⓐ Ⓦ HANDLE, RIGHT CUT SMALL INCISION THRU CENTER OF LABEL TO LOOSEN NUT LABEL NUT, HEX, #6-
VT-751D and VT-752D DISASSEMBLY INSTRUCTIONS UNPLUG HEAT GUN. TAKE NOTE OF WIRING LAYOUT. To remove dial, gear and support (Figure 2) NOTE: Dial, Gear, and Support must be removed to remove the circuit board and motor. 1. Cut small incision thru center of label on dial to expose the #6-32 nut Ⓐ. and washer. 2. Loosen the #6-32 nut, Ⓐ and remove the dial Ⓑ, spring and the gear Ⓒ. The nut and washer Ⓐ can remain assembled between the label and the dial. 3.
VT-751D and VT-752D To remove the element connector: 1. Disconnect the black lead wire of the element connector from circuit board (Figure 5). Disconnect the white lead wire of the element connector (with piggyback terminal) from both the white wire of the motor and the white wire of the cordset (Figure 3). Figure 6 To remove the cordset: 1. Remove the green ground screw located near the nozzle of the housing (Figure 1). Remove the black cordset wire from the piggyback terminal of the jumper, (Figure 6).
VT-751D and VT-752D To install the CORDSET: 1. Install new cable ties in metal housing (Figure 11). 2. Connect the green cordset wire to the enclosure’s ground post using the green screw (Figure 1). 3. Connect the black cordset wire to the jumper’s piggyback terminal attached to the switch (Figure 10). 4. Connect the white cordset wire to the element connector’s white wire piggyback terminal (Figure 3). 5. On 220-240V cordsets use supplied cord clamp (figure 11).
VT-751D and VT-752D To install the SUPPORT, GEAR and DIAL: 1. Assemble #6-32 hex bolt Ⓕ into bottom of support Ⓔ and attach the support to housing with #6-32 x .50 inch screws Ⓓ (Figures 2). 2. Attach gear Ⓒ to knurled stem and rotate fully counter-clockwise (Figures 12). 3. Place wave spring into pocket of support Ⓔ (Figures 12). 4. Align the dial Ⓑ with the number “9” at the top and assemble onto the support Ⓔ.
VT-751D and VT-752D TROUBLESHOOTING GUIDE SYMPTOM CAUSE Motor screw not tight or missing Excessive Vibration SOLUTION Recheck that all screws are present and tighten to correct torque Blower wheel loose or damaged Tighten or replace blower wheel if damaged Blower wheel not positioned correctly on motor shaft Ensure top of motor shaft is flush with top of blower wheel hub Wires rubbing on blower wheel Ensure wires are in proper position and out of way of blower wheel Unit is not plugged in Plug in
