Maintenance – Rover 5377 - 12HP User Manual

Page 9

MAINTENANCE

COOLING SYSTEM

The Ranger has an air cooled 4 stroke engine. It must be

cleaned frequently. Remove any build-up of grass, dirt or other

debris from the -
1.

Cylinder;

Cylinder head cooling fins;

Cooling air intake screen and;

Carburetor governor levers and linkages.

This will ensure adequate cooling and correct engine speed.

THROTTLE CONTROL

Proper choke and stop switch operation is dependant on

adjustment of remote controls –

Loosen outer cable clamp screw (D) on engine; See
Fig.9.

Set throttle control to choke position;

Adjust outer cable under clamp plate so that choke is

operated;

Tighten clamp plate screw and check –

a. Choke does not operate in fast position,

and

b. Stop switch operates correctly.

CARBURETOR ADJUSTMENT

The carburetor has been factory set and should only require

occasional fine tuning. See Figs.9 & 10.

Close high speed needle valve (A) in bottom of
carburetor bowl. Close finger tight in clockwise

direction;

Open (anti-clockwise) the needle valve 2 turns (that is

an approx. setting);

Start engine and let it warm up. Approx. 2 minutes.

Cutter drive must be disengaged. Speed Select-or must

be in Neutral position and Park Brake applied, air

cleaner must be fitted and secured and fuel tank must
be half full.

With the engine running at high speed, adjust the

needle valve 1/8 turn at a time. Clockwise or anti-

clockwise until engine runs smoothly.

NOTE

: Allow several seconds between each adjustment for

engine to adapt to the new setting

Move throttle to the slow position and adjust the slow
running stop screw (B) to give an engine speed of 1700

to 1800 RPM.

Adjust the idle needle valve (C) slowly in (lean) and out

(rich) until engine idles smoothly.

Reset engine idle speed.

Check operation. Engine should increase speed

without hesitation when throttle control is moved

quickly from slow to fast. If the engine tends to die out,

adjust the high speed needle valve 1/8 turn anti-
clockwise until engine accelerates smoothly.

Never tamper with the engine governor setting.

Changing the engine governor speed will void engine

warranty.

LUBRICATION GENERAL

Using General Purpose Grease – (Every 25 hours)

Grease nipples on front wheel pivots. See Fig.11

Front Axle beam guides

Grease nipples on steering pivot blocks Fig.21

Steering gears Fig.21

Grease nipple on engagement lever pivot Fig.23

Using Clean Engine Oil –
-

Jockey pivot arms

Throttle control cable Fig.9

Chain Fig.23