Stihl Ht 75 Owners Manual

							10 english
HT 70, HT 75!
Warning!
To reduce risk of serious or fatal injury 
from loss of control of the pole pruner 
never attempt to operate any pole 
pruner with one hand. Always hold the 
pole pruner firmly with both hands.
Wrap your fingers tightly around the 
control handle and shaft, keeping the 
handle and shaft between your thumb 
and forefinger.Keep your hands in this position to have 
your pole pruner under control at all 
times. Make sure the handle and shaft 
are in good condition and free of 
moisture, pitch, oil or grease. Place your 
left hand on front handle and your right 
hand on rear handle and throttle trigger. 
Left handers should follow these 
instructions too.
!
Warning!
Do not operate your pole pruner with the 
starting throttle lock engaged. Cutting 
with the starting throttle lock engaged 
does not permit the operator proper 
control of the pole pruner or chain 
speed. Always cut at full throttle.
!
Warning!
Never touch a chain with your hand or 
any part of your body when the engine is 
running, even when the chain is not 
rotating. The chain continues to rotate 
for a short period after the throttle trigger 
is released.
Do not cut any material other than wood 
or wooden objects. Use your pole pruner 
for limbing only. It is not designed for 
felling. It is not designed for prying or 
shoveling away limbs, roots or other 
objects.When limbing, make sure that the saw 
chain does not touch any foreign 
materials such as rocks, fences, nails 
and the like. Such objects may be flung 
off and injure the operator or bystanders, 
or damage the saw chain.
!
Warning!
In order to keep control of your pole 
pruner, always maintain a firm foothold. 
Never work on a ladder, in a tree or on 
any other insecure support. When 
working at a height above 4.5 m (15 ft) 
use a lift bucket.
For pole pruner with adjustable shaft: 
Expand the shaft only as far as 
necessary for the intended application.
!
Warning!
Dont put pressure on the pole pruner 
when reaching the end of a cut. The 
pressure may cause the bar and rotating 
chain to pop out of the cut or kerf, go out 
of control and strike the operator or 
some other object.
!
Warning!
Prior to limbing, clear the working area 
from interfering limbs and brush. Then, 
establish a path of escape and remove 
all obstacles.
390BA026 KN 
						

							11 HT 70, HT 75english
Keep work area clear – move away 
fallen limbs. Place all tools and 
equipment at a safe distance from the 
branches being limbed, but not on the 
escape path.
!
Warning!
To reduce the risk of personal or even 
fatal injury from falling objects do not cut 
vertically above your body. Hold the pole 
pruner at an angle of not more than 60° 
from the horizontal level (see picture). 
Objects may fall in unexpected 
directions. Do not stand directly 
underneath the limb being cut!Watch for falling wood! As soon as the 
limbed branch starts to fall, step aside 
and keep distance away from the falling 
wood.
!
Warning!
Always observe the general condition of 
the tree. Look for decay and rot in the 
trunk and branches. If it is rotted inside, 
it could snap and fall toward the operator 
while being cut. Also look for broken or 
dead branches which could vibrate 
loose and fall on the operator.
If branch is thick or heavy, make a 
shallow relief cut on the bottom of the 
branch before cutting down from the top 
to help prevent splitting of the branch. 
Always pull the unit out of the cut with 
the chain running to reduce the 
possibility of pinching the cutting 
attachment.
If the bar becomes pinched and caught 
in the branch so that the chain can no 
longer move, shut off the pruner and 
carefully move the branch to open the 
pinch and release the bar.
MAINTENANCE, REPAIR AND 
STORING!
Warning!
Maintenance, replacement, or repair 
of the emission control devices and 
systems may be performed by any 
nonroad engine repair establishment 
or individual. However if you claim 
warranty for a component which has 
not been serviced or maintained 
properly or if nonapproved 
replacement parts were used, STIHL 
may deny warranty.
Never operate a pole pruner that is 
damaged, improperly adjusted or not 
completely or securely assembled. 
Follow the maintenance and repair 
instructions in the appropriate section of 
your Owners Manual, especially those 
in the chapters  Mounting the Bar and 
Chain and Maintaining and 
Sharpening Saw Chain.
!
Warning!
Use only STIHL replacement parts for 
maintenance and repair. Use of parts 
manufactured by others may cause 
serious or fatal injury.
max
60°
390BA025 KN 
						

							12 english
HT 70, HT 75!
Warning!
Always shut off the engine and ensure 
that the chain is stopped before 
undertaking any adjustments, 
maintenance or repair work, changing 
the saw chain or cleaning the pole 
pruner. Do not attempt any maintenance 
or repair work not described in your 
Owners Manual. Have such work 
performed at your STIHL service shop 
only.
!
Warning!
Never test the ignition system with 
ignition wire terminal removed from 
spark plug or with unseated spark plug, 
since uncontained sparking may cause 
a fire.
!
Warning!
To reduce the risk of fire and burn injury, 
use only spark plugs authorized by 
STIHL. Always press spark plug boot 
snugly onto spark plug boot of the 
proper size. (Note: If terminal has 
detachable SAE adapter nut, it must be 
attached.) A loose connection between spark plug 
boot and ignition wire connector in the 
boot may create arcing that could ignite 
combustible fumes and cause a fire. 
Keep spark plug clean, and make sure 
ignition lead is in good condition.
!
Warning!
Do not operate your pole pruner if the 
muffler is damaged, missing or modified. 
An improperly maintained muffler will 
increase the risk of fire and hearing loss. 
Never touch a hot muffler or burn will 
result. If your muffler was equipped with 
a spark-arresting screen to reduce the 
risk of fire (e. g. in the USA, Canada and 
Australia), never operate your pole 
pruner if the screen is missing or 
damaged. Remember that the risk of 
forest fires is greater in hot or dry 
weather.
Keep the chain, bar and sprocket clean; 
replace worn sprockets or chains. Keep 
the chain sharp. You can spot a dull 
chain when easy-to-cut wood becomes 
hard to cut or burn marks appear on the 
wood.Keep the chain at proper tension. 
Tighten all nuts, bolts and screws except 
the carburetor adjustment screws before 
each use.
Additionally, the daily maintenance 
schedule for your pole pruner set forth in 
your STIHL Owners Manual should be 
strictly followed.
Store pole pruner in a dry place and 
away from children. Before storing for 
longer than a few days, always empty 
the fuel tank.
For any maintenance please refer to the 
maintenance chart and to the warranty 
statement near the end of this manual. 
Store fuel and chain oil in approved and 
properly labeled safety-type canisters 
only. Take care when handling gasoline! 
Avoid direct contact with the skin and 
avoid inhaling fuel vapor! 
						

							13 HT 70, HT 75english
Preparations:Wear suitable protective clothing 
and equipment – see chapter 
Safety Precautions.
:Adjust telescopic shaft to the 
required length (HT 75 only).
:Start the engine.
:Put on the shoulder strap.
Never throw cuttings into the 
household garbage can – cuttings 
can be composted.
Never stand directly underneath the 
branch you are cutting – be wary of 
falling branches. Note that a branch 
may spring back at you after it hits 
the ground.Cutting sequenceTo allow branches a free fall, always cut 
the lower branches first. Prune heavy 
branches (large diameter) in several 
controllable pieces.
Working techniquesHold the control handle with your right 
hand, and the shaft with your left hand. 
Your left arm should be extended to the 
most comfortable position.
HT 70:
Always hold the shaft with your left hand 
in the area of the handle hose.
The shaft should always be held at an 
angle of 60° or less.The most convenient working position is 
a tool angle of 60°, but any lesser angle 
may be used to suit the situation 
concerned.
Cross-cut
Position the cutting attachment with the 
hook against the branch and then 
perform the cross-cut.
Using the Pole Pruner
390BA018 KN
390BA052 KN 
						

							14 english
HT 70, HT 75 Relieving cut
:To avoid kickback, pinching the bar 
or tearing the bark when pruning 
thick branches, always start by 
performing a relieving cut (1) on the 
underside of the branch.
:To do this, apply the cutting 
attachment and pull it across the 
bottom of the branch as far as the 
bar nose.
:Locate the hook against the branch 
and then perform the cross-cut (2).Flush-cutting thick branches
:If  branch diameter is more than 4“ 
(10cm), first perform undercut (3) 
and then cross-cut at a distance of  
about 8“ (20cm) (A) from the final 
cut. 
Then carry out the flush-cut (4), 
starting with a relieving cut and 
finishing with a cross-cut.Cutting above obstacles
The units long reach makes it possible 
to prune branches that are overhanging 
obstacles, such as rivers or lakes. The 
tool angle in this case depends on the 
position of the branch.
2
1
390BA041 KN
3
4
A
390BA024 KN
390BA020 KN 
						

							15 HT 70, HT 75english
Cutting from a lift bucket
The units long reach enables cutting to 
be performed next to the trunk without 
the risk of the lift bucket damaging other 
branches. The tool angle depends on 
the position of the branch.30° angle drive
(special accessory for HT 70)
The angle drive keeps the cutting 
attachment at an angle of 30° to the 
drive tube.
The angle drive may be adjusted on the 
drive tube to the following positions only:
1:For cross-cutting vertical branches 
and bushes.
2:For a better view of the cutting 
attachment.
  
390BA017 KN
1
2
390BA053 KN 
						

							16 english
HT 70, HT 75 :Unscrew nut and take off cover.
:Turn tensioning screw (1) 
counterclockwise until the 
tensioning nut (2) butts against the 
left end of the housing slot, then 
back it off 5 full turns.The chain is very sharp – wear work 
gloves to protect hands from cuts.
:Fit the chain – 
start at the bar nose.:Fit guide bar over the stud (3). 
Engage peg of tensioner slide in 
locating hole (4) – place the chain 
over sprocket (5) at the same time.
:Now turn tensioning screw (1) 
clockwise until there is very little 
chain sag on the underside of the 
bar – and the drive link tangs are 
located in the bar groove.
:Refit the sprocket cover and screw 
on the nut only fingertight.
:Now refer to Tensioning the Saw 
Chain.Mounting the Bar and Chain
390BA042 KN
1
2
390BA043 KN
390BA003 KN
1 5
390BA044 KN
43 
						

							17 HT 70, HT 75english
Retensioning during cutting work: 
:Shut off the engine and then 
slacken the nut.
:Hold the bar nose up.
:Use screwdriver to turn the 
tensioning screw (1) clockwise until 
chain fits snugly against the 
underside of the bar. 
Tighten down the nut  firmly.
A new chain has to be retensioned more 
often than one that has been in use for 
some time – check chain tension 
frequently – see chapter Operating 
Instructions / During Operation“. 
:Check chain tension.:Shut down the engine.
:Wear work gloves to protect hands.
:Chain must fit snugly against the 
underside of the bar and it must still 
be possible to pull the chain along 
the bar by hand.
:If necessary, retension the chain.
A new chain has to be retensioned more 
often than one that has been in use for 
some time.
Check chain tension frequently – 
see chapter Operating Instructions / 
During Operation“. A properly adjusted throttle cable is 
the precondition for correct 
operation in the full throttle, starting 
throttle and idle positions.
Adjust the throttle cable only after 
the unit is fully assembled.
:Use a suitable tool to push the slide 
to the bottom of the slot (see 
illustration).
* see Guide to Using this Manual
Tensioning the Saw Chain
1
390BA045 KN
Checking Chain Tension
390BA046 KN
Adjusting the Throttle 
Cable*
002BA163 KN 
						

							18 english
HT 70, HT 75 :Press down the trigger interlock (1) 
and squeeze the throttle trigger (2)  
(full throttle) – this sets the throttle 
cable correctly.This engine is certified to operate on 
unleaded gasoline and the STIHL two-
stroke engine oil at a mix ratio of 50:1.
Your two-stroke engine requires a 
mixture of brand-name gasoline and 
quality two-stroke air cooled engine oil.
Use mid-grade unleaded gasoline with a 
minimum octane rating of  89 (R+M/2). If 
the octane rating of the mid-grade 
gasoline in your area is lower, use 
premium unleaded fuel. 
Fuel with a lower octane rating may  
increase engine temperatures. This, in 
turn, increases the risk of piston seizure 
and damage to the engine.
The chemical composition of the fuel is 
also important. Some fuel additives not 
only detrimentally affect elastomers 
(carburetor diaphragms, oil seals, fuel 
lines, etc.), but magnesium castings and 
catalytic converters as well. This could 
cause running problems or even 
damage the engine. For this reason 
STIHL recommends that you use only 
nationally recognized name brand 
unleaded gasoline!Use only STIHL two-stroke engine oil or 
equivalent branded two-stroke engine 
oils that are designed for use only in air 
cooled two-cycle engines. 
We recommend  STIHL 50:1 two-stroke 
engine oil since it is specially formulated 
for use in STlHL engines.
Do not use BIA or TCW rated (two-
stroke water cooled) mix oils or other 
mix oils that state they are for use in both 
water cooled and air cooled engines 
(e.g., outboard motors, snowmobiles, 
chain saws, mopeds, etc.).
Take care when handling gasoline. 
Avoid direct contact with the skin and 
avoid inhaling fuel vapor. When filling at 
the pump, first remove the canister from 
your vehicle and place the canister on 
the ground before filling. Do not fill fuel 
canisters that are sitting in or on a 
vehicle.
The canister should be kept tightly 
closed in order to avoid any moisture 
getting into the mixture.
The machine‘s fuel tank and the canister 
in which fuel mix is stored should be 
cleaned as necessary.
21
002BA161 KN
Fuel 
						

							19 HT 70, HT 75english
Fuel mix ages
Only mix sufficient fuel for a few days 
work, not to exceed 3 months of storage. 
Store in approved fuel-canisters only. 
When mixing, pour oil into the canister 
first, and then add gasoline. Close the 
canister and shake it vigorously by hand 
to ensure proper mixing of the oil with 
the fuel.       
Dispose of empty mixing-oil canisters 
only at authorized disposal locations.Before fueling, clean the filler cap and 
the area around it to ensure that no dirt 
falls into the tank.
Always thoroughly shake the mixture in 
the canister before fueling your 
machine.
In order to reduce the risk of burns 
or other personal injury from 
escaping gas vapor and fumes, 
remove the fuel filler cap carefully 
so as to allow any pressure build-up 
in the tank to release slowly.
After fueling, tighten fuel cap 
as securely as possible by hand. Change the fuel pick up body every year.
Before storing your machine for a long 
period, drain and clean the fuel tank and 
run engine until carburetor is dry.
Checking oil level
Check chain oil level in tank at 
regular short intervals and fill up as 
necessary. Gaso-
lineOil (STIHL 50:1 or 
equivalent branded oils)
US gal. US fl.oz
12.6
2 1/2 6.4
512.8
Fueling
389BA031 KN
389BA032 KN