SECTION I DESCRIPTION AND USE OF
OPERATOR'S CONTROLS AND INDICATORS
2-1. GENERAL OPERATOR INFORMATION.
The Ground Handling Wheels Assembly operator's controls and indicators are described in this section. The functional
use of each control and indicator is explained.
2-2. DESCRIPTION OF OPERATOR'S CONTROLS AND INDICATORS.
The Ground Handling Wheels Assembly operator's controls consist of the hydraulic hand pump handle, pressure control
valve knob, and removable quick release pin. A fillport /hydraulic fluid level indicator is located under the reservoir
cap. Figure 2-1 shows the location of each control and indicator The metering valve operates automatically, but is
included In this description. A model number Is included with the title of a description, unless the description applies to
all models covered In this manual.
2-2.1 Hydraulic Hand Pump Handle Description. The hydraulic hand pump handle has a curved design to minimize
equipment damage or personnel injury. It is attached to the pump piston and pump housing with pivot pins. A hand grip
is provided to ensure safe operation in all weather conditions
2-2.2 Hydraulic Pressure Control Valve Knob Description. The knob is attached to the hydraulic hand pump control
valve shaft with a setscrew. When the knob is moved fully clockwise, the control ball check-valve is closed. When the
knob is moved fully counterclockwise, the control valve is open.
2-2.3 Hydraulic Pressure Metering Valve Description. The metering valve is installed in the pump outlet and looks
like a common fitting. A reducer and tee fitting are installed in the metering valve outlet. The purpose of the valve is
to control the descent rate of the helicopter, when lowering it to the ground.
2-2.4 Quick Release Pin Description, Model 204-050-200-5. A quick release pin is mechanically connected to the
support pin. The release pin is pushed to engage or disengage the support pin with the helicopter skid. An
internal spring returns the pins to the extended position.
2-2.5 Quick Release Pin Description, Model 214-706-104-101 and Model 1730-EG-100. The quick release pin has
an internal spring, two locking balls, and a release button. The spring applies pressure to the locking balls
whenever the release button Is extended. When the release button Is pressed, spring pressure Is relaxed and the
locking balls retract Into the pin. The pin cannot be Installed In or removed from the cradle clevis unless the
release button Is pressed and held. A lanyard connects the pin to the cradle, to prevent loss when the pin is
removed from the cradle clevis.
2-2.6 Fluid Level Indicator Description. The fluid level indicator in installed in the end of the hydraulic pump
reservoir, under the reservoir cap. A sight glass allows visual verification of the fluid level.