7© Airtec International Ltd. All Rights Reserved. No reproduction of whole or part of this Manual is allowed without written Permission of Copyright.
New Master35© Impact Wrench
Maintenance Manual
ROUTINE SERVICE SEE EXPLODED DIAGRAM DRAWINGS ON PAGES 10-14 AND 16-18
1. REPLACING SPARK PLUG 4003.5010
Lift two Cover Clips and lift off Filter Cover 4003.3010. Pull
off Spark Plug Cover. Unscrew Spark Plug and replace with
Champion RCJ4 or equivalent making sure the gap is set at
0.5mm (0.02”).
2. REPLACING AIR FILTER 4003.3080
Remove the Filter Cover by
lifting the Filter Cover Clips.
Loosen the two air filter
screws and remove it.
Clean with a suitable
degreaser, rinse with
water and blast dry with
compressed air. Renew the
filter if heavily clogged or
damaged.
3. REPLACING FUEL FILTER 4003.1075
With the Wrench in a vertical
position open Fuel Cap
4003.6020 cautiously to release
any build-up of pressure in the
Fuel Tank. Pull out Fuel Filter and
replace if dirty.
4. REPLACING STARTER ROPE 4003.0340
Remove four Screws 4003.2070 holding Starter Assembly
4003.2190 and Screws 2300.0520 off muffler guard and
remove Starter Assembly. Hold Pulley 4003.2130 with thumb,
cut old cord and allow Pulley to turn slowly back until no
tension is left in Recoil Spring 4003.2150. Remove Centre
Screw 4003.0690 and Washer 4003.0700 and slowly lift off
Pulley. Fit new Rope through Pulley and tie a knot. Feed other
end of Rope through Starter Assembly 4003.2190 and into
Starter Handle 4003.2180 and again tie a knot. Locate Pulley
in Recoil Spring and replace Centre Screw 4003.0690 and
Washer 4003.0700. Locate Rope in the notch on outside of
pulley, turn clockwise two complete turns then release. Repeat
until the Starter Handle returns to the Housing locating hole -
Approximately six complete turns when pulled out. Re-attach
starter assembly.
5. REPLACE GEAR BOX OIL
Remove three Screws 2300.0512 in Gear Selector 2870.1000
and remove from Gear Box. Empty out old oil. Fill gearbox with
0.25 litres (½ pint) of Gazpromneft Reductor CLP68, Mobil Gerar
626, Carter EP68, Merpoa 68, Valvoline 80-90W or an equivalent
non synthetic 68 viscosity Gear Oil. Re-fit Selector and fit screws
using a suitable fastener locking fluid.
6. GREASING HAMMER AND ANVIL
Remove three nuts 2310 2061, four Screws 2300.0851 and Nose
Casing 035301. Clean out old grease and replace with 130
grammes (4 ½ ozs) of new Molybdenum Disulphate Grease
Grade 2 Ensure this is pumped into holes on the side of
Hammer Casing 2590.1000 and onto all eight striking faces.
Use of the correct quality grease will extend the life of both
Anvil and Hammer.
7. ENGINE
Clean Starter Housing and Cylinder Fins at regular intervals. Use
either a brush or compressed air. Dirt build up on the cylinder
will generate overheating which could then reduce engine
performance.
8. CARRYING AND THROTTLE HANDLE
Replace Rubber Mounts when they are ineffective or worn out.
9. ROUTINE MAINTENANCE INSTRUCTIONS
It is recommended a record of inspections and maintenance
is kept and each Wrench is given a routine maintenance
check every three months. This will reduce maintenance costs,
improve efficiency and extend its useful life. Fix a label showing
next Service date
DAILY Check all Bolts, Screws and Nuts for
tightness and gearbox oil level.
WEEKLY Clean Air Filter and Fuel Filter.
If necessary use a suitable Solvent.
MONTHLY Clean Spark Plug and check gap is 0.5 m
THREE MONTHS As above plus following:- Clean internal
Hammer and Anvil Faces thoroughly and
replace Grease.
SIX MONTHS Change Fuel Filter and check condition of
Air Filter and Spark Plug
ANNUALLY Replace Gear Box Oil
Use only GENUINE MASTER SPARE PARTS This will cost less
than using non original Spare Parts which generally don’t last
as long. Use of non-original parts reduces Wrench life cancels
Warranty
