Taylor TX180S, Руководство по обслуживанию

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22-1 22-1 TX / TXH / TXB 180S - 400L (Rev. 4/23/07) TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
causes LC2 to open and LC3 to close enough to causes LC2 to open and LC3 to close enough to
satisfy the steering flow requirement (Load sense satisfy the steering flow requirement (Load sense
pressure can pressure can be measured be measured at port at port LSM). LSM). Excess Excess
flow is available for use by the hoist and tilt. flow is available for use by the hoist and tilt.
When load sense (steering) pressure reaches the When load sense (steering) pressure reaches the
setting of relief valve [RV2 (which must be set at a setting of relief valve [RV2 (which must be set at a
pressure equal to or lower than RV1)], RV2 opens pressure equal to or lower than RV1)], RV2 opens
causing LC3 to causing LC3 to open as well. open as well. Pump flow Pump flow is then is then
sent to sent to hoist and tilt hoist and tilt . . (Refer to (Refer to the the HYDRAULIC HYDRAULIC
PRESSURE SETTINGS PRESSURE SETTINGS in the in the Appendices Appendices for for
RV1 and RV2 pressure settings.) RV1 and RV2 pressure settings.)
Hydraulic Logic Hydraulic Logic (Illustration 22-20) (Illustration 22-20) . . Hydraulic Hydraulic
flow from the secondary gear set of the main flow from the secondary gear set of the main
pump enters at the inlet of the accessory valve. pump enters at the inlet of the accessory valve.
Flow then passes through the manifold where it Flow then passes through the manifold where it
joins with the flow from the joins with the flow from the primary pump. primary pump. The The
combined flows then enter the hoist and tilt valve. combined flows then enter the hoist and tilt valve.
Pump flow from the secondary gear set is always Pump flow from the secondary gear set is always
available for accessory functions such as side available for accessory functions such as side
shifter and fork positioners if the truck is so shifter and fork positioners if the truck is so
equipped. equipped. Pump flow Pump flow from the from the primary pump primary pump
must satisfy steering requirements first, but must satisfy steering requirements first, but
excess flow is always available for hoist and tilt excess flow is always available for hoist and tilt
functions. functions. The total flow The total flow from both pumps from both pumps is avail- is avail-
able to hoist and tilt if there is no requirement from able to hoist and tilt if there is no requirement from
steering or steering or accessory funct accessory funct ions. ions. Flow returns Flow returns to to
the tank from the tank from the hoist the hoist and tilt valve and tilt valve outlet. outlet. The The
outlet is outlet is equipped with equipped with two returns. two returns. An inline An inline
check valve has been installed at the hydraulic check valve has been installed at the hydraulic
ORF1 and check valve (CK1) to start the accumu- ORF1 and check valve (CK1) to start the accumu-
lator charging lator charging process. process. As pressure As pressure builds in builds in the the
charge circuit, the pressure reducing valve (PRV1) charge circuit, the pressure reducing valve (PRV1)
supplies pilot fluid for accessory valve and hoist / supplies pilot fluid for accessory valve and hoist /
tilt valve tilt valve operation. operation. When the When the PRV1 valve PRV1 valve setting setting
is reached, it closes off and all flow through the is reached, it closes off and all flow through the
circuit is directed to the parking brake and service circuit is directed to the parking brake and service
brake ac brake ac cumulators. cumulators. When When both both accumulators accumulators
reach full pressure, determined by the unloader reach full pressure, determined by the unloader
valve (UNL1), the pilot to the spring chamber of valve (UNL1), the pilot to the spring chamber of
logic element (LC1) is drained and pump flow is logic element (LC1) is drained and pump flow is
directed to the drive axle to cool the left side drive directed to the drive axle to cool the left side drive
axle brake. axle brake. Flow from Flow from the other gear the other gear set cools set cools the the
fluid of t fluid of t he right side he right side drive axle brak drive axle brak e. e. As pres- As pres-
sure falls in the accumulators, the pressure signal sure falls in the accumulators, the pressure signal
to UNL1 falls to UNL1 falls and closes it and closes it . . The process The process repeats repeats
itself. itself. Relief valve Relief valve (RV3) protects (RV3) protects the pump from the pump from
over-pressurization and acts as a thermal relief over-pressurization and acts as a thermal relief
also. also. The parking The parking brake is brake is electrically applied electrically applied and and
released by released by solenoid SOL1. solenoid SOL1. Pressure must Pressure must be be
held on the spring-applied / hydraulic-released held on the spring-applied / hydraulic-released
parking brake (located on the transmission out- parking brake (located on the transmission out-
put). put). Both brake Both brake pedals are s pedals are s upplied from pres upplied from pres - -
sure and flow sure and flow stored in acc stored in acc umulator (ACC2). umulator (ACC2). The The
LH foot pedal inches the transmission and applies LH foot pedal inches the transmission and applies
the wheel the wheel brakes. brakes. The RH The RH foot pedal foot pedal applies the applies the
wheel brakes only wheel brakes only . . (Refer to (Refer to the the
HYDRAULIC HYDRAULIC
PRESSURE SETTINGS PRESSURE SETTINGS in the in the Appendices Appendices for for
pressure settings.) pressure settings.)
MAIN PUMP MAIN PUMP
(Illustrations 22-9 and 22-10) (Illustrations 22-9 and 22-10)
AUXILIAR AUXILIAR Y PUMP Y PUMP
(Illustration 22-11) (Illustration 22-11)
HYDRAULIC HYDRAULIC
JOYSTICK JOYSTICK
CONTROLLER CONTROLLER
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