Procedure for Charge Relief Valve Pressure Test:
Make sure hydraulic oil is at normal operating tem-
NOTE: If charge pressure is good under no load, but
drops below specification when under traction load, the
piston pump and/or wheel motor(s) should be sus-
pected of wear. When a pump and/or motor is worn or
damaged, the charge pump is not able to keep up with
internal leakage in the traction circuit.
1.
perature.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
10.Stop
machine and shut off engine.
3.
Read Precautions for Hydraulic Testing.
11.
Relieve hydraulic system pressure (See Relieving
Hydraulic System Pressure in the General Information
section). Disconnect gauge and T--connection from the
90
WARNING
o hydraulic fitting and hose connection. Reconnect
hose to the hydrostat.
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
2
1
4.
Disconnect hose to the rear 90o hydraulic fitting on
thepistonpumpcomingfromthehydraulicmanifoldport
(CHG). Connect T--connector and hydraulic pressure
gauge to the fitting and hose connection.
5.
Make sure that traction pedal is in neutral and the
parking brake is engaged.
6.
+
Start engine and operate engine at full speed (3050
50 RPM).
Figure 17
1.
90o hydraulic fitting
2.
Piston pump
7.
Pressure gauge should read from 100 to 150 PSI.
Record test result.
8.
Ifchargereliefpressurespecification isnotmet,con-
sider the following:
A. The piston pump charge relief valve is faulty. Re-
pair or replace the piston pump charge relief valve
(seePistonPumpServiceintheServiceandRepairs
section).
B. Gear pump (P2) is faulty (steering and lift circuits
are also affected).
9.
Adynamicchargepressuretestcanbeperformedas
follows:
A. With T--connector and hydraulic pressure gauge
still connected, sit in the operator seat and press the
traction pedal to forward.
B. While machine is moving, monitor the charge
pressure reading on the pressure guage.
C. The charge pressure should drop no more than
15%
from initial test reading (Step 7 above) as the
machine is moving. A pressure drop of more than
indicates a traction circuit leak (e.g. a worn or
15%
damaged piston pump and/or wheel motor).
Groundsmaster 3505--D
Page 4 -- 29
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 3505 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)