88 Hydraulic System
When the dual vane pump is turned on, the IFM electronic control module (ECM) starts monitoring
the vehicle and the engine speed, and allows the vane pump to engage (or not). If the vehicle is going
faster than 15 mph (25 km/h) or if the engine speed exceeds 900 RPM, the vane pump will not
engage. After the pump is engaged, it will stay as is at any engine speed under 2300 RPM (for more
information, see Allison Transmission Parameters on page 187).
The first section of the vane pump, known as the body vane pump, powers all body functions (tailgate,
crusher panel [if equipped], packer, side bucket [if equipped] and cart tipper [if equipped]) through
the body control valve (see below). It is capable of delivering a flow of 20 gallons per minute (GPM)
at 1200 RPM. If the engine speed exceeds 1200 RPM, the IFM multiplexed system, installed on the
truck, will send an electrical signal to the body control valve in order to vary the spool position of a
specific valve section. On M
INIMAX™ vehicles, only the packer section spool will vary its position
according to that signal. There are no restrictions on the flow coming into the other body valve
sections.
The second section of the vane pump, known as the arm vane pump, powers arm functions (arm up/
down, arm in/out, and grabber open/close) through the arm control valve (see Arm Control Valve on
page 89). It is capable of delivering a flow of 14 gpm at 1200 RPM. If the engine speed varies, the IFM
multiplexed system, installed on the truck, will send an electrical signal to the arm control valve in
order to vary the spool position of a specific valve section. On M
INIMAX™ vehicles, all arm valve
spools except the one that controls the grabber will vary their position according to that signal.
Body Control Valve
MINIMAX™ vehicles are equipped with a body control valve (see Figure 5-3). As part of the body vane
pump system, this control valve powers all body functions (tailgate, packer and optional crusher
panel, side bucket and cart tipper).
Figure 5-3
3- section body control valve
Packer
Tailgate
Crusher panel
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