Labrie MINIMAX, Maintenance Manual

Page: 84 / 174

76 Hydraulic System
When the dual vane pump is turned on, the IFM electronic control module (
ECM
) starts monitoring
vehicle and 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 engine speed exceeds 900 rpm, the vane pump will not engage. After the
pump is engaged, it will stay engaged at any engine speed under 2,300 rpm (for more information, see
Allison Transmission Parameters on page 150).
The first section of the vane pump, known as the body vane pump, powers all body functions (tailgate,
crusher panel, packer, and cart tipper [if installed]) 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 77). 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
M
INIMAX
™ vehicles are equipped with a body control valve (see Figure 5-3). As part of the body vane
pump, this control valve powers all body functions (tailgate, crusher panel, packer, and cart tipper [if
installed]).
Figure 5-3 Body control valve
Packer
Tailgate
Crusher panel