Procedure for Steering and Lift/Lower Gear Pump
Flow Test
IMPORTANT: The gear pump is a positive displace-
ment type. If pump flow is completely restricted or
stopped, damage to the pump, tester or other com-
ponents could occur.
NOTE: Output from the steering and lift/lower gear
pump section is equally divided by a proportional valve
to provide flow to the steering circuit and the lift circuit.
The proportional valve is in the fan drive manifold.
7. Move throttle so engine is running at high idle speed
(2870 RPM). DO NOT engage the cutting deck.
NOTE: If steering and lift/lower gear pump section is
worn or damaged, charge, steering and lift circuits will
all be affected.
8. While watching pressure gauge on the tester, slowly
close flow control valve until 1000 PSI (69 bar) is ob-
tained on gauge. Verify that engine speed continues to
be 2870 RPM.
NOTE: While rotating the steering wheel and raising
thedeckatthesametimewiththeenginerunningathigh
idle speed (2870 RPM), an indication of gear pump
damage may be the steering wheel getting hard to turn
and/or the cutting deck raising very slowly.
GAUGE READING TO BE: Flow approximately 7
GPM (26 LPM) at 1000 PSI (69 bar).
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
1.
Make sure hydraulic oil is at normal operating tem-
9.
gine. Record test results.
Open the tester flow control valve and stop the en-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
10.If
a pressure of 1000 PSI (69 bar) could not be ob-
tained or flow is lower than 6 GPM (23 LPM), check for
restriction in pump intake line. If intake line is not re-
stricted, consider that the gear pump is worn or dama-
ged.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged. Raise and support seat.
Parkmachineonalevelsurfacewiththecuttingdeck
11.
nect hose to pump fitting.
When testing is complete, remove tester and recon-
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
2
RIGHT
FRONT
3
3.
hose at the third gear pump section which supplies the
steering and lift/lower circuits (Fig. 47).
Thoroughly clean junction of fitting and hydraulic
4
4.
Withtheengineoffandcuttingdecklowered,discon-
nect the hydraulic hose from the 90o fitting in the third
gear pump section.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow from the pump section, through the tester and
into the hydraulic hose.
1
Figure 47
5.
Install tester with pressure gauge and flow meter in
1.
2.
Gear pump
Fan drive manifold
3.
4.
Steering/lift supply hose
90 fitting
series between the fitting and the disconnected hose.
Makesuretheflowcontrolvalveonthetesterisfully
open.
o
6.
speed. Check for hydraulic leakage at tester location
and correct before proceeding with test.
After installing tester, start engine and run at idle
Groundsmaster 4100--D/4110--D
Page 4 -- 65
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 10177SL, Toro Groundsmaster 30447, Toro Groundsmaster 30449, Toro Groundsmaster 4100, Toro Groundsmaster 4110 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
(0 votes, average: 0 out of 5)