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A-dec/W&H Contra Angle – Base Block Removal

Tools Required:

TSTWA99-KIT

Contains:
TST677 (Spray Cover Plate Holding Tool)
TST680 (Spray Cover Plate Removal Tool)
TST681 (Spray Nut Removal Tool)
TST618 (Cap Wrench)
TST830 (Press Pin)
TST831 (Gear Puller Plate)
TGT292 (Press Pin)

Replacement Parts

HWH8500

DR29A2L-801

DR42Z2G-814

Head Gear Assembly & Intermediate Shaft

Replacement Parts Diagram For A-dec / W&H WA-99 LT (5 Ports)

wa-99 head breakdown

A-dec/W&H Contra Angle – Base Block Removal
To open and remove the base block

se flat head screw driver (2.3mm) to open to screws on the back end of the handpiece and gently pull the head assembly to remove it from the handpiece body shell. (Fig. 1)

wa-99 remove base block

To remove intermediate shaft
Use 6mm wrench, turn counter-clockwise to open and remove the intermediate shaft from the head shell. (Fig.2)

wa-99 remove intermediate shaft

To remove head cap
Use cap wrench part number TST680; engage the cap wrench tool into the head cap and turn counter-clocwise to open and remove the head cap. (Fig. 3)

wa-99 remove head cap

To remove the head cartridge & spring load
Use blank bur to push and revove the head cartridge (Fig. 4 & 5)

wa-99 remove cartridge wa-99 remove cartridge step 2

To remove the water spray nut
Use tool TST681 to open the water spray nut by turning clock-wise (Fig. 6)
Note: Water spray nut has Left-handed thread

wa-99 water spreay parts
wa-99 water spray nut removal

To remove the water spray plate and seal
Press the tool TST677 into front end of handpiece head, make sure the flange on the tool is flushed with the face of water spray plate, use your thumb and index figures to hold the front part of the tool and turn the back end of the tool clock-wise until the tool is locked into the water plate. (Fig. 7)

wa-99 water spray plate and seal removal

Next, use tool TST680 thread in (clock-wise) on the other side of the head shell to push the water spray plate and the tool TST677 out of handpiece shell (Fig. 8)

wa-99 water spray plate and seal removal step 2

Next, Turn the back end of the tool TST677 counter-clockwise to un-lock the water spray plate and O- ring seal on the top of the water plate (Fig. 9)

wa-99 water spray plate and seal removal step 3

To remove and replace bearings for head gear
Use puller plate part # TST831 and press pin part # TST830 to press and remove bearings(Fig. 11)

wa-99 cartridge bearins
wa-99 remove and replace bearings

To remove and replace fiberoptic rod
After pulling the back block out of the handpiece body shell, gently pull the fiber optic rod out of the back block and replace with a new one Fig. 12

wa-99 fiber optic rod removal

To remove bottom drive shaft
Loosen the 2 screws on the back end, the push the shaft on bottom block to remove the drive shaft. Fig. 13

Reassembly by reversing the order of disassembly instruction above
Run the handpiece and check for quality, autoclave and return to services.

wa-99 reassembly