TM 5-2420-230-24-1
c. Secondary System.
NOTE
Unlike a conventional split system, the brakes on all four wheels will operate.
The secondary system will operate if air pressure is lost in the primary system. The modulating valve will sense the loss
of pressure in the primary system and the foot pedal will then modulate the release of air from the spring brake chamber.
As the air pressure decreases, the spring brake chambers will operate under spring pressure, progressively applying the
brakes.
8-3. VEHICLE PREPARATION AND ISOLATION.
Prior to performing any maintenance on the Interim High-Mobility Engineer Excavator (IHMEE), perform the following
procedure:
(1)
Ensure vehicle is positioned on level ground.
(2)
Ensure parking brake is applied (TM 5-2420-230-10).
(3)
Raise Front-End Loader (FEL), install maintenance arm, and lower FEL onto maintenance arm, as required
(4)
Shut OFF engine (TM 5-2420-230-10).
(5)
Place electrical master switch in OFF position (TM 5-2420-230-10).
(6)
Attach "Do Not Operate" tag to ignition switch (TM 5-2420-230-10).
8-4. RESTORE IHMEE TO OPERATIONAL READINESS.
Upon completion of maintenance activities, restore power and return vehicle to operational readiness using the following
procedure:
(1)
Place electrical master switch in ON position (TM 5-2420-230-10).
(2)
Remove "Do Not Operate" tag from ignition switch (TM 5-2420-230-10).
(3)
Ensure parking brake is applied (TM 5-2420-230-10).
(4)
Start engine (TM 5-2420-230-10).
(5)
Raise FEL, remove maintenance arm, and lower FEL to ground or travel position, as required
(6)
Complete necessary documents and return IHMEE to relevant authority.
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