Alpha Tool.Com.HK Limited Polisher VSP120 User Manual

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Periodic maintenance is done to check the tool and to minimize down time. These 
checks are done based on hours of operation and operating conditions.  Operating 
condition can vary depending on the work surface and job being preformed.  If the 
tool is not used for a long period of time the carbon brushes should be checked and 
the commutator cleaned, before putting the tool back into operation.
BEAriNGS AND GEArS
To minimize your tool’s down time and expensive tool repairs, it is recommended 
to  send  the  tool  back  to  an  Alpha
®  Repair  Center  after  about  300  to  400  hours 
of  operation  or  every  second  carbon  brush  set  change.  The  bearings  should  be 
replaced and the gears should be checked. If your tool starts to sound differently, this 
could be an indication of a worn bearing; continuing to use the tool in this condition 
could result in over heating or motor failure.
CArBON BrUSH rEPLACEMENT
Carbon brushes wear out over time, based on the polisher usage. If a carbon brush 
is worn out, it may cause the motor to malfunction or fail to run. Whenever the length 
of the carbon brush reaches the wear limit, replace with a new set.
NOTE - To maintain even wear, both brushes should be replaced at the same time. 
The carbon brushes in this polisher are located underneath the Rear Cover (Part 
# 210053) as shown in Figure 23.
Carbon brushes are located under the rear 
cover
Figure-23  
						

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rEAr COVEr rEMOVAL
1.     Gently  pull  water  tube  away  from 
holder.
2.    Release the tube from the holder.
3.  Unwrap  3  inches  of  the  coiled 
harness.
4.    Remove the 2 screws from the valve 
bracket.
Figure-24
Figure-25 Figure-26
Figure-27  
						

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5. Pull the valve assembly away from 
mount.
6.    Remove the rear case screw.
7.  Hold  polisher  with  one  hand  and 
pull the rear case straight back with 
the other hand.
NOTE: Do not twist case in a side to side 
motion when pulling back.
8.       Pull  back  the  rear  case  until  the   
carbon brush assembly is exposed.
NOTE: Do not pull rear case further back 
from this point.
Figure-28
Figure-29
Figure-30
Figure-31  
						

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Carbon Brush
Carbon BrushHolder
Carbon Brush Wire
Spring
Figure-32
Figure-33
Figure-34 Figure-35
9. 
  Lift  the  spring  from  the 
carbon  brush  and  lace  on 
the side of the brush holder.
10.    Remove  the  carbon  brush 
wire spade connector from 
the  terminal  post  and  then 
remove the carbon brush.
Spade Connector  
						

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11.   
You  can  also  remove  the  carbon  brush  by 
removing  the  screw  and  pulling  the  holder 
out with a pair of needle nose pliers.
12.     With  the  carbon  brush  holder  removed, 
you  can  check  and  clean  the  armature 
commutator. The commutator is the contact 
points that the carbon brushes ride on when 
the motor is running.
NOTE: Each polisher has 2 carbon brushes located on opposite sides of 
each other. After the replacement of the two brushes, assemble the polisher 
by reversing disassembly procedure.
13.  Check the carbon brush for wear.  Replace if worn down to a 1/4" .
14.  .  Blow dust off of the spring and check for proper tension.
15.    Remove  the  old  carbon  and  disconnect  the  wire  terminal  wire.  If  the  inside 
of the holder is filled with dust, clean before installing the new carbon brush.  
Upon installation of the new carbon brush, make sure the twisted wire is in the 
slot and behind the wire terminals on holder as in the photo above.
New Carbon Brush
Figure-37Old Carbon Brush
worn down to a quarter of 
an inch (1/4”).  
						

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16. The commutator should be clean and shiny; if it is dull and black, you can clean 
it with a commutator cleaning stone.
17.  To  clean  the  commutator,  press  the  commutator  cleaning  stone  against  the 
commutator  and  rotate  the  armature  by  turning  the  spindle  shaft  by  hand.  
Continue for a minute or until commutator is clean and shiny.
18.  Reconnect  the  power  wire,  ensuring  that  the  wire  path  is  correct.    Reinstall 
the  carbon  brush  holder  into  the  slot  on  motor  housing  and  slide  in  until  the 
tab for the screw hits the stop.Install the screw using light pressure to prevent 
it from stripping.
19.    After both carbon brushes have been replaced you can reassemble the rear 
cover. Make sure the power wires are in the tool to prevent pinching of the wires.
CleanDirty
Figure-38 Figure-39
Figure-40  
						

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ALPHA® VSP-120 SCHEMATIC  
						

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ALPHA® VSP-120 PARTS LIST
DRAWING NO.PART NO.DESCRIPTION QUANTITY
1 210001Screw M4×14 4
2 210002Spring Washer 4 5
3 210003Plain Washer 4 4
4 210004Shower Bolt 1
5 210109Output Shaft with Nitriding 120V (5/8”-11UNC) 1
6 210006Key 3×10 2
7 210090Gear Case Cover 1
8 210008Oil lip seal B16×28×7D 2
9 210009Bearing  Washer 1
10 210010Ball bearing NSK6201-2DW 1
11 210011Gear Washer 1
12 210012Thrust Bearing 15×28×6 1
13 210013Bearing Clamp 1
14 210014Spring Washer 5 4
15 210015Screw M5×16 4
16 210016Gear 1
17 210017Wave Spring  lock  Washer10 1
18 210018“C” clip for  shaft 10 1
19 210019Oil-impregnated Bearing8×12×8 2
21 210021Self-tapping Screw ST4.2×45 1
22 210022Case Plastic Cover 2
23 210023Screw M10×20 2
24 210024C-Handle 1
27 210027Gear Case 1
28 210028Anti-loose Nut M6 1
29 210029Pinion Z3 1
30 210030Transmitting Shaft 1
31 210031Ball Bearing NSK6200-2DW 1
32 210032Bevel Gear Z2 1
33 210033Screw M4×8 2
34 210034Bearing Retainer 1
35 210035O-Ring 21.2×1.8 1
36 210036Ball Bearing BONA608ZZ 1
37 210102Armature 120V 1
38 210038Ball Bearing BONA607ZZ 1  
						

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ALPHA® VSP-120 PARTS LIST
DRAWING NO.PART NO.DESCRIPTION QUANTITY
39 210039Rubber Bearing Seat 1
40 210106Windshield 1
41 210041Self-tapping Screw ST4.2×70 2
42 210042Field Coil 1
43 210099Brand Label 1
44 210091Field Coil Case 1
45 210092Data Label 1
46 210046Carbon Brush Holder 2
47 210047Coil Spring 2
48 210048Carbon brush   2
49 210049SST Self-tapping Screw ST2.9×8 4
50 210094Terminal Block 1
51 210093Speed pot w/Feed-back sensor 120V  1
53 210053Rear Cover 1
54 210054Self-tapping Screw ST4.2×14 3
55 210055Cord Jacket 1
56 210056Twist Strip 1
57 210057Rubber Washer 1
58 210058Garden Hose Adapter 1
59 210059Spring   1
61 210061Power Supply Cord 120V 1
62 133229Water Hose 8mm ODx10ft (3m) 1
63 210063Water Valve Bracket (for VSP120) 1
64 210064Water Valve Assembly (for VSP120) 1
65 210065Water Hose 6mm ODx8in (20cm) 1
66 210066Cord Clamp 1
67 210067Outlet Tap 1
68 210068Switch 1
69 210069Back Moving Spring 1
70 210070Switch Push Lever 1
71 210071Switch Push Button 1
72 210072GFCI 120V(American) 1
73 210110Wrench-19mm (for VSP120) 1
74 210074Side Handle (for VSP120) 1
75 210075O-Ring15×2.65 1  
						

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ALPHA® VSP-120 PARTS LIST
SERVICES AND WARRANTY INFORMATION
LOANEr PrOGrAM
Loaner tools can be issued to temporarily replace a tool that is being returned to 
Alpha® for repair.  If more than one tool is being returned for repair, the number of 
loaner tools provided will be based on availability.
If  a  loaner  tool  is  required,  contact Alpha
® Tool  Department  at  (800)  648-7229  to 
receive a Loaner Tool Application. A valid credit card number must be provided as a 
security deposit. The credit card will only be charged if the loaner tool is not returned 
to Alpha
®  within  30  days. An  authorized  signature  is  required  for  the  credit  card 
being used. A second signature is required as an agreement of the overall policy.
NEED MOrE iNFOrMATiON
For information on Alpha Professional Tools® complete product line, visit us on the 
web at www.alpha-tools.com
DRAWING NO. PART NO.DESCRIPTION QUANTITY
76 210076Dash Panel 1
77 210077Self-tapping Screw ST4.2×40 2
78 210078Self-tapping Screw ST4.2×10 2
79 210079Water value Tap   1
80 210088Band Clamp 40-63 1
81 210089Splash guard  1
82 210095Magnetic Ring 1
83 210096Screw M4×8 1
84 210097Terminal  connector 1
88 210108Rubber Band 1
89 210107Splash Sleeve 1
(not shown) 210087BMC (Blow Mold Case) for VSP-120