Toro 74160, 74170, 74171, 74172, 74173 Service Manual
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HYDRO-GEAR BDP-10L SERVICE AND REPAIR MANUAL
Table of Contents – Page 1 of 1
INTRODUCTION/GENERAL DESCRIPTION: BDP-10L VARIABLE PUMP
INTRODUCTION
GENERAL DESCRIPTION
BDP-10L VARIABLE PUMP: SU PPO RT SYSTEM
TRANSMISSION HYDRAULIC SUPPORT SYSTEM
SAFETY PRECAUTIO NS
CONTROLS AND FEATURES: BDP- 10L V ARI AB LE PUM P
DIRECT DISPLACEMENT CONTROL
CHARGE PUMPS
BYPASS VALVE
BDP-10L VARIABLE PUMP: START-UP & MAINTENANCE
FLUIDS
START-UP PROCEDURE
MAINTENANCE
TROUBLESHOOTNG CHART: BDP-10L VARIABLE PUMP
BDP-10L VARIABLE PUMP: MINOR REP AIR
GENERAL
PLUG/FITTING TORQUES
SHAFT SEALS
CHARGE CHECK VALVES
BYPASS VALVE
CHARGE PUMP
BDP-10L VARIABLE PUMP: MAJO R REPAIR
GENERAL
DISASSEMBLY PRO CED URES FOR VARIABLE PUMP
RECONDITIONING AND REPLACEMENT OF PARTS
ASSEMBLY PROCEDURES FOR VARIABLE PUMP
PARTS DRAWING & PARTS LIST: BDP-10L VARIABLE PUMP
VARIATION CHART: BDP-10L
PRODUCT LINE: HYDRO-GEAR
A WORLD LEADER IN TURF CARE TRANSMISSION PRODUCTS
Hydro-Gear
Table
of
Contents
Description
Introduction
General Description
Support System
Controls & Features
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Start-up & Maintenance
Troubleshooting Chart
Minor Repair
General
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Plug/Fitting Torques
Shaft Seals
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1
2
3
4
5
6
6
6
6
Copyright
All
right
reserved
Charge Check Valves
Bypass Valve
Charge Pump
Major Repair
General
Disassembly Procedures
Reconditioning & Replacement
Parts Drawing & Parts List
Variation Chart
1992.
Hydro-Gear.
.
Contents
Inc.
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subject
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BDP
Service
Manual
Introduction General Description
The purpose of this manual
useful
in
servicing the Bantam Duty Hydrostatic Pumps.
This manual includes unit and component description,
troubleshooting, minor repair procedures, and major
repair procedures.
A
pump normally will not require servicing during the lie
of the vehicle or machine in which
servicing be required, some repairscan beaccomplished
without removing the unit from
provided that the unit is accessible and can be thoroughly
cleaned before beginning any procedures. Since dirt or
contamination is the greatest enemy of any hydraulic
equipment, the greatest possible cleanliness is neces-
sary.
is
to provide information
it
is
installed. Should
its
installed location,
The BDP pumps can be combined with motors and other
remotely
units provide an infinitely variable speed range between
zero and maximum in both forward and reverse modes of
operation.
The BDP-1
for vehicle applications where up to
required for the propel function, or for auxiliary functions
where the system pressure requirements and design life
can be met within the pump rating. This variable
ment pump
(10
Pumps are of the
nosed
each piston, holds the
bearing
The variable displacement pump features a cradle
swashplate with a direct-proportional displacement con-
trol. Reversing the direction of tilt of the swashplate
reverses the flow of oil from the pump and thus reverses
the direction of the motor output rotation.
located
cc/rev).
pistons. A compression spring, located inside
units. When used in this manner, these
0L
is
a variable displacement pump designed
six
horsepower
has
a maximum displacement of
axial
piston design, utilizing spherical
nose
of the piston against a thrust
0.61
race.
is
displace-
in³/rev
BDP-10L
Pump
A
fixed displacement gerotor charge pump is provided in
the BDP-10L units. Oil from an external reservoir and
fitter is pumped into the closed loop by a charge pump.
Fluid not required to replenish theclosed loop flows either
into the pump housing through a cooling orifice, or back
to the charge pump inlet through the charge pressure
relief valve.
Charge check valves are included in the pump end cap
to control the makeup oil
flow
for the system.
valve is utilized in the pumps to
for short distances at
the engine.
BDP
Service
Manual
Transmission Hydraulic Support System
The charge pump incorporated into the
supplies fluid to keep the closed loop charged, prevent- at high pressure,
ing cavitation and providing cooling oil flow for the
system. An inlet filter
clean fluid enters the system. The charge relief valve
designed
PSI
at
to
maintain the charge pressure at
3600
RPM
is
required to insure that
input speed.
BDP-1
0L
units Since either
only
is
25
to
70
used
to
direct make-up fluid into the low pressure side
of
the closed
the pump end
of
the main hydraulic passages can be
two
(2)
charge check valves are
loop.
These check valves are located in
cap.
FILTER
Controls and Features
Direct Displacement Control
The direct-proportional displacement control
vides a simple method of
swashplate control shaft produces a proportional swashplate movement and change in pump flow and/or direction.
If
difficulties are encountered with the control, inspect the
connection of the control linkage to the swashplate
control
tached.
the neutral
shaft
to insure that the linkage
The vehicle/machine control system determines
position
of the linkage.
control.
Movement of the
(DDC)
is
properly at-
pro-
Charge Pumps
A
fixed displacement gerotor type charge pump is pro-
vided as
Bypass
In
for
engine.
side of the pump/motor circuit to the other, thus allowing
the motor to turn with little resistance.
part
some
applications, it
short
distances at low
A
of
the
BDP-1
0L.
Valve
is
desirable to move the machine
speeds
bypass valve allows oil to be routed from one
without operating the
BDP-10L
Variable
Pump
with
Charge
Pump
The
BDP
variable pumps utilize a screw type bypass
valve which is
maximum. The bypass valve must
normal
vehicle operation.
fully
open when unscrewed
be
two
(2)
turns
fully closed during
Start-up & Maintenance
Fluids
Fluids used with Hydro-Gear products should
ly selected with assistance from a reputable supplier.
Typically, an API classification SG/CD engine oil is used
with a viscosity range equivalent to
Start-up
The following start-up procedure should always be fol-
lowed when starting a new installatiin or when restarting
an installation in which the BDP had been removed from
the system.
Procedure
20W50.
be
careful-
-
Start the engine and run at the lowest possible RPM.
With the bypass valve closed, slowly move the displace-
ment control in both the forward and reverse directions.
As
will
reservoir
Place thedisplacement control in the neutral position and
open
control in both the forward and reverse directions to
purge the air from the closed circuit.
Close the bypass valve and run the unit in both directions
for several minutes until any remaining air is purged from
the unit.
Shut down the engine, check for and correct any fluid
leaks, and check the reservoir level. Add fluid
Prior to starting the BDP, make certain all system components (reservoir, fittings, etc.) are clean prior to filling
with fluid.
sary. The transmission is now ready for operation.
Maintenance
air
is
purged from the unit, the oil level in the reservoir
drop and bubbles may appear
as
necessary.
the bypass valve. Slowly move the displacement
Refill
the reservoir as necessary.
in
the fluid. Refill the
if
neces-
Be
certain to
prior
to
into the upper case drain
Fill the reservoirwith
filtered prior to entering the reservoir.
The inlet line and filter leading from the reservoir to the
charge pump must
line for properly tightened fittings and make sure it is free
of restrictions and air
Pressurizing the inlet
slowly rotate the engine with the swashplate in its neutral
(0
angle) position until charge pressure starts to rise
(charge pressure is defined as
Page
4
fill
start-up.
the
BDP
housing with clean fluid
Fill the housing by pouring filtered oil
port,
if
possible.
recommended fluid which
be
filled prior to start-up. Check inlet
leaks.
2-4
PSI
will
aid in start-up.
low
side loop pressure).
should
be
"Jog"
or
Check the reservoir daily for proper fluid level, the
presence of water (noted by a cloudy to milky appearance,
or
free water in bottom of reservoir), and rancid
fluid odor (indicating excessive heat).
The BDP-1
changes. The system filter should be changed per the
vehicle/machine manufacturer's recommendations. The
fluid and fitter should
if
the fluid becomes contaminated with foreign matter
(water, dirt, grease, etc.) or if the fluid has been subjected
to temperature levels greater than the maximum recom-
mended.
0L
units normally do not require regular fluid
be
changed and the system cleaned
BDP
Service
Manual
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