Karcher STH 953 manual Maintenance tasks

English Operating Manual – Snowthrower

Maintenance tasks

!Risk of injury

Before doing any work on this machine

–Turn off the engine.

–Remove the ignition key and the spark-plug connector.

–Wait until the engine has cooled down.

Caution

Risk of damage to the machine

When replacing parts of the machine use only original spare parts.

Clean the machine

•Park the machine on a firm, even and horizontal piece of ground.

•Remove any dirt sticking to it.

•Clean the machine by pouring water through the throw-out chute, leave it to dry.

•Clean engine with a cloth and brush.

Lubrication

Lubricate all rotating and mobile parts with a light oil.

Adjust tyre pressure (STH 5.56, STH 8.66)

Recommended tyre pressure approx. 1 bar.

Maintenance work on the engine

See “Engine instructions”.

Adjust coupling for the worm drive

(STH 5.56, STH 8.66, STH 10.66 C)

Figure 3

Check the state of the coupling:

•Press left coupling lever (1) forwards (direction I); at the same time press down rubber (3). Coupling cable (5) must be a little slacker. Slacken it if necessary (see “Making adjustments to the coupling cable”).

•Release the coupling lever (1). There must be no slackness on the coupling cable (5) but it must not be taut either. Adjust if necessary (see “Making adjustments to the coupling cable”).

•The coupling lever (1) must allow itself to be pressed down completely. If it does not, the coupling cable is tightened too firmly and must be slackened (see “Making adjustments to the coupling cable”).

Adjust coupling for the drive system

(STH 5.56, STH 8.66, STH 10.66 C)

Figure 1

•(Machines with caterpillar drive) Set setting lever (Figure 4, item 1) to position III (Transport).

•Set shift lever (6) to the fastest forward gear (highest figure).

•Having released the coupling lever (2), push the machine forwards.

•While you are pushing the machine, set shift lever (6) to the fastest reverse gear “R ” and then set it to the fastest forward gear.

•If some resistance is felt while you are pushing the machine or changing gear, you need to slacken the coupling cable (see “Making adjustments to the coupling cable”).

•While you are pushing the machine, press coupling lever (2). The wheels/caterpillar tracks must become blocked. If not, tighten the coupling cable a little (see “Making adjustments to the coupling cable”).

•If you have not been able to make a perfect adjustment or if in doubt about the result, see “Checking the drive system”.

Making adjustments to the coupling cable

(STH 5.56, STH 8.66, STH 10.66 C)

Figure 3

•For coupling cables with adjusting sleeves (6)

–Tighten: loosen nut (7) and screw adjusting sleeve (6) against it.

–Slacken: loosen adjusting sleeve (6) and screw nut (7) against it.

•For coupling cables with load- removal spring (8): Before making an adjustment the spring must be unhooked and afterwards hooked

on again. The coupling cable is correctly adjusted when the spring expands 2 to 3 cm when coupling takes place.

–Tighten: Screw lock-nut (9) upwards.

–Slacken: Screw lock-nut (9) downwards.

Checking the drive system

(STH 5.56, STH 8.66, STH 10.66 C)

Figure 13

Caution

Risk of damage to the machine

Take care when tipping the machine to see that

–the machine stays balanced and

–no fuel or oil runs into the air filter or out of the machine.

•Loosen screws to frame cover; if necessary tip the machine forwards.

•With the coupling lever for the drive system released (Figure 1, item 2) change into all gears; in doing so the friction wheel (2) should not come into contact with the drive wheel (3). If it does, slacken the coupling cable (see “Making adjustments to the coupling cable”).

•In each gear, press the coupling lever for the drive system; the friction wheel must make contact with the drive wheel. If it does not, tighten the coupling cable (see “Making adjustments to the coupling cable”).

•As required clean the drive wheel and the rubber on the friction wheel; they must be free of grease.

•If necessary remove ice on parts which are iced over.

Tightening the V-belt (STH 953)

Figure 5

If the worm is running irregularly at the constant engine speed, the tension of the V-belt (5) must be adjusted.

•If there is an additional hole (3b) on the coupling lever (1), hook the coupling cable (2) into the higher hole (3b).

23