Aimco Brakes Screwdriver LT Screwdriver Repair Manual

							PO 
Box  16460,  Portland, OR  97292-0460   503-254-6600   Fax  503-255-2615  Lite - Touch Series  
Pneumatic Screwdriver Repair Manual  
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							Contents  
Page  
Number  
1. Tools Needed for Repair 1  
2. P neumatic Screwdriver Repair Fixtures 2  
3. Disassembly and Reassembly of the Clutch 3 - 4  
4. Exploded View of  the Clutch   Assembly 5  
5. Disass embly and Reassembly of the Gear Section 6  
6. Exploded View of  the  Gear Casing Assembly
 US - LT30B - 11 Series 7  
 US - LT20B - 18 7  
 US - LT Series 8  
7. Disassembly and Reassembly of the  Air Motor Section 9  
8. Exploded View of  the  Air Motor Assembly
 US - LT   Push to Start Seri es 10  
 US - LT   Pistol Series 11  
 US - LT   Lever Series 12  
9. Disassembly and Reassembly of the  Angle Head   Section 13  
10. Exploded View of  the  Angle Head Assembly
 US - LT   Series 14  
11. LT Series Troubles hooting 15  
12. Recommended  Prevent at ive Maintenance 16   
						

							- 1   -Tools Needed fo r Repair  
US - LT Drivers  
1. Phillips  D river s ( #1 & #2 )
2. Dental Pick
3. Pin Spanners ( # 351)
4. Needle Nose Pliers
5. Pin Punch
6. Ball Peen Hammer (8 oz.)
7. Standard Pliers
8. Snap Ring Pliers
9. Crescent Wrench
10. Lock Ring & Horses hoe Washer Pliers (Proto - P250)
11. Propane Torch (Turner Self - Lighting) 
						

							- 2   -Pneumatic Screwdriver Repair Fixtures  
US - LT Series Jig List  
Jig  t o Insert  t he Band  o n  t he Anvil  
Part  
Number   Model Number  
471 - 670 - 7 - 1 US - LT Series  
Jig  t o Hold Tool  for  Disassembly & Re assembly  
Part  
Numbers   Model Numbers  
459 - 025 - 1 - 0 US - LT10 & US - LT20  
408 - 025 - 1 - 0 US - LT30 & US - LT40  
444 - 025 - 4 - 0 US - LT50   
						

							- 3   -Disassembly and Reassembly of the Clutch  
Disassembly  
1. Separate the Clutch Casing from the Gear  Casing and remove the Clutch Assembly.
2. Remove the Regulator Screw by inserting a Phillips Driver between it and the Retainer and turning the
Phillips Driver counter - clockwise.
3. Slide the Retainer off the Anvil.     Make sure not to lose the Pin that  locks the Retainer to the Anvil.
4. Remove the Torque Spring, Spring Setter, and Back - up Ring from the Anvil.
5. Carefully slide the Cam Ring up and remove the four Balls from under it.     Now remove the Cam Ring.
6. Lift the hooked end of the Band out   of the hole in the Anvil and slide it around the Anvil until the end of the
Notch Pin is exposed.    Now remove the Notch Pin.    Caution :     Do not bend or stretch the Band out of shape.
7. Remove the Snap Ring from the back of the Anvil.
8. Slide the Anvi l Spacer up and remove the Balls that hold the Cam in the Anvil.   Note :  “C”   model clutches
do not have the Snap Ring, Anvil Spacer, or Balls.
9. Now slide the Cam and Pilot Pin out of the Anvil.    Remove the Pilot Pin from the Cam.
10. Remove the Ball a nd Spring from out of the Anvil.
11. Thoroughly clean all parts.
Inspection  
1. Cam : Inspect the Cam Lobes for grooving where the y push the Ball out against  the Cam Ring.  
Pilot Pin : Inspect the shoulder that is pushe d up against the Notch Pin for  ro unding.  
Notch Pin :   Inspect the ends for rounding.  
Cam Ring :   Inspect the inside surface where the Balls ride for pit ting and  grooving.  
Balls :   Inspect for pitting.  
2. Inspect all Springs for tension.
3. Replace all worn parts.
Rea ssembly  
1. I nstall the Pilot Pin into the Cam with the square end up.
2. Put the Spring and Ball into the Anvil and slide the Cam into the Anvil.
3. Line up the groove on the Cam with the hole in th e Anvil and install all of the  Balls that hold the Cam in
place.
4. Install  the Anvil Spacer and Snap Ring.   Note :     Make sure the Anvil’ s Spacer is inst alled the correct way.
Consult  breakdown for the tool you  are working with for proper  installation.
5. Install the Notch Pin into the Anvil and slide the Ba nd back  into place.  Now rotate  the Cam and make sure
the Notch Pin is pushing the Band up.
6. Put a small amount of grease in each hole of the Anvil and install the Balls. 
						

							- 4   -Disassembly and Reassembly of the Clutch   (cont.)  
7. Slide the Cam Ring down onto the   Balls.
8. Put the Back - up Ring and Spring Retainer down onto the Cam.
9. Install the Torque Spring and Retainer onto the Anvil.
10. Line the slot in the Anvil with the slot in the Retainer and install the Locking Pin.
11. Thread the Regulator Scre w onto the Anvil (counter - clockwise) .
12. Install the Clutch back into the tool and test. 
						

							- 5   -Exploded View of the Clutch Assembly  
US - LT Series  
Part  
Number   Description   Part  
Number   Description  
1  
3  
4  
5  
6  
7  
8  
9  
10  
1 1  
1 2  
1 3  
1 4  
1 5   Bushing  
Clutch Casing Sleeve  
O - Ring  
Clutch Casing  
Spring  
Bit Sleeve  
Regulator Screw  
3/32 Steel Ball  
Torque Spring  
Back - up Ring  
1/8 Steel Ball  
Notch Pin  
3/16 Steel Ball  
“G” Pin   1 6  
1 7  
1 8  
1 9  
20  
2 1  
2 2  
2 3  
2 4  
2 5  
2 6  
2 7  
2 8   3/32 Steel Ball  
Anvil  Spacer  
Snap Ring  
Pin  
Retainer  
Spring Setter  
Cam Ring  
Bit Band  
Anvil  
Notch Pin Band  
Spring  
Pilot Pin  
Cam    
						

							- 6   -Disassembly and Reassembly of the Gear Section  
Disassembly  
1. Remove Gear Casing f rom the Air Motor Casing (right - hand thread).
2. Remove the   Snap Ring from the front of the Gear Casing.
3. Remove the Planet Gears and the Gear Cage from   the Gear Casing.  In some Gear  Casings ,   the Gear Cage
will come out the front of the Gear Casing.
4. Remove the Bearing from the Gear Casing.
5. Clean all   parts thoroughly.
Inspection  
1. Inspect the teeth of the Gear Casing and Planet Gears for pitting and grooving.
2. Inspect Needle Rollers for wear.
3. Inspect Bearings for side play and knocking.
4. Replace all worn parts.
Assembly  
1. Install  the Bearing and Snap Ring into the front of the Gear Casing.    Note :  Except  for  the US - LT20 - 18  &
US - LT30 - 17, proceed to step # 6.
2. Install the Second Gear Cage into the Casing.
3. Install three Needle Rollers and the first set of Pl anet Gears.  Put a s mall amount  of grease by each Planet
Gear and on the Gear Cage.
4. Install the First Gear Cage,   Needle Rollers ,   and t he second set of Planet Gears.   Put a small amount of
grease by each Planet Gear and on the Gear Cage.    Note :   On the mid and low RPM s,  ma ke sure to install
the Spacer.
5. If the tool you are working with has a Rotor Ge ar, install the Rotor Gear and  Spacer into the Gear Cage.
6. On the US - LT30 - 17 ,   install the Planet Gears an d Needle Rollers into the Gear  Cage.    Now install the Gear
Cage  into the Gea r Casing through the front and  install the Bearing and Snap Ring.
7. On the US - LT20 - 18 ,   install the Internal Gear on th e top of the Air Motor section  and over the Rotor.    Now
install the Planet Gears a nd Needle Roller into the Gear  Cage.     Mak e sure the timing marks an d   top of the
la rger end are lined up opposite  one another and install into  the  Internal Gear.     S lide the Gear Casing down
over the  Internal Gear and thread onto  the  Air Motor Casing.
8. Install the Gear Casing Assembly onto the  Air Motor Casing and test the tool. 
						

							- 7   -Exploded View of the Gear Casing Assembly  
US - LT30B - 11 Series   US - LT20B - 18  
Part  
Number   Description   Part  
Number   Description  
1  
2  
3  
4   Gear Casing  
Needle Roller  
Planet Gear  
Gea r Cage   5  
6  
7  
8   Ball Bearing  
Spacer  
Spacer  
Internal Gear