Key Switch; Pre-Heating The System - New Holland TC21D Operator's Manual

10. Rear PTO Speed—Determined by the position
of the needle on the tachometer. The tachometer
is marked to indicate 540 PTO RPM. Engine
RPM should remain close to this mark while
using the rear PTO; running the engine faster
than this results in a dangerous overspeed
condition.
11. Parking Brake Light—Illuminates if the parking
brake is engaged when the key switch is turned
from the "OFF" position.

KEY SWITCH

The key switch, 1, is located on the right-hand side
of the console just below the hand throttle. Turning
the key right to the "ON" position activates the
warning lights and instruments. The pre-heat system
is activated when the key is turned further to the right
to the "HEAT" position, and the engine starts when
the key is turned to the extreme right. The key spring
returns to the "ON" position when released.

PRE-HEATING THE SYSTEM

Your tractor has a diesel engine. Before starting a
cold engine, the precombustion chambers must be
heated.
To pre-heat the engine, turn the key switch to the
"HEAT" position and hold the key in this position for
approximately 5 seconds. The glow plugs heat the
precombustion chambers during this time, and the
engine will start.
NOTE: When ambient temperatures are colder, a
longer pre-heat time is necessary. Even after the cold
start indicator light has gone out, the glow plugs will
continue to heat if the key is held in the "HEAT"
position.
WARNING
Do not use ether with the thermostat starting aid.
NOTE: A coolant immersion heater is available as a
dealer-installed option. This heater allows for easier
starting in temperatures below 0 ° F (-17.7 ° C) by
warming the engine coolant.
SECTION 2 - OPERATION
10020246
2-5
SBA390197280
1
8