Technical data

53
3.3.22. Checking the Condition of the Engine Starter
Perform the preventive inspection of the starter every 2,000 service hours of the diesel
engine.
Remove the protective cap and check the conditions of the collector, brushes and brush
armature. If the collector is dirty, wipe it using a clean napkin moistened in gasoline. If the collec-
tor is burnt, trim it with fine-grained emery paper or smooth it up on a lathe.
The brushes should move in brush-holders freely and adjoin the collector tightly. In case
the brushes are worn out to 0.4 in (10 mm) size or there are chips, replace the brushes for new
ones.
To check the contacts of the electromagnetic relay, remove the cover. If the contact
bolts and disk are burnt, smooth them up with fine emery paper or fine file.
If the contact bolts are considerably worn at the places of their junctions with the contact
disk turn the bolts by 180 and turn the disk inside out.
Check visually the condition of the driving gear and stop split ring. The clearance be-
tween the gear face and stop split ring shall be 2...4 mm when the armature is in the engaged posi-
tion.
If necessary, adjust the clearance. To do this loosen the lock nut and set the clearance to
be (0.120.04) in [(31) mm], than tighten the lock nut.
When being checked on the test bench, the starter in good order shall consume the idling
current of not more than 120 A and the rotational speed of the armature shall be not less than
5,000 rpm.
3.3.23. Maintenance and Washing of the Cooling System
Fill the cooling system with pure soft water or coolant with low freezing temperature.
Soften the hard water by adding 0.35-0.42 oz (10-12 g) of soda ash per 2.64 gal liq US (10 l) of
water.
Monitor the coolant temperature; the normal working temperature shall be 75-95C. If
the temperature exceeds the normal value, check the coolant level in the radiator, leak-proofness
of the radiator and tension of the fan belt.
As often as necessary, but at least every 2,000 service hours of the diesel engine wash
the cooling system to clean it from dirt. For washing use the solution of 1.76-2.12 oz (50-60 g) of
soda ash per 0.26 gal liq US (1 l) of water.
Wash the system in the following order:
- pour 0.53 gal liq US (2 l) of kerosene into the radiator and full the system with the pre-
pared solution;
- start the diesel engine and let it run for 8-10 hours, then pour the solution out and wash
the cooling system with pure water.
3.3.24. Maintenance of the Alternator
When operating the engine, the alternator needs no special service. The seasonal adjust-
ment of the alternator voltage is performed by means of the “Winter-Summer” seasonal voltage
adjustment screw located on the rear panel of the alternator, as shown in Fig. 31.
When operating the engine ensure the reliability of fastening the alternator and wires, as
well as cleanness of the external surface and terminals.
Check the serviceability of the alternator by means of the control lamp and ammeter
mounted in the instrument panel of the tractor (machine). If the alternator is in good order, the