Cab Pressurizer Blower; Background; Power And Ground - New Holland T8010 Manual

Cab Pressurizer Blower

NOTE: See Electrical Schematic sections 58, 60 and 61.

Background

Whenever switched power is present, the cab
pressurizer motor should operate. The motor/blower
assembly draws air from the cab cap through the left
hand cab post and fresh air filter and feeds it directly
to the HVAC box under the operators seat. The
motor/blower assembly is located behind the fresh air
filter.

Power and Ground

Unswitched B+ is continuously provided to the relay on pin A3 from fuse 10 (15 amp). The relay is grounded on pin
A2 to the engine relay.
Whenever Switched B+ is present, the relay is energized on pin A1, and Unswitched B+ is supplied to the cab
pressurizer motor on pin A through C10-85.
Clean ground is continuously supplied to the motor on pin B from the Splice F3.
Section 50 - Climate Control - Chapter 1
50-1-88
The motor is energized by a relay, activated by
switched B+.
On ly th e pr essu r i zer blower r elay an d motor
troubleshooting are covered here.