Procedure for Traction Circuit Relief Pressure Test
Make sure hydraulic oil is at normal operating tem-
NOTE: Seal leakage across pilot directional valves
PD1 and PD2 in 4WD/2WD control manifold can also
cause low forward traction pressure with reverse pres-
sure meeting specifications.
1.
peraturebyoperatingthemachineforapproximatelyten
(10)
minutes. Make sure the hydraulic tank is full.
NOTE: Forward and reverse relief valves are identical.
Relief valves can be switched in piston (traction) pump
to help in identifying a faulty relief valve.
CAUTION
9.
gauge from test port.
When testing is completed, disconnect pressure
Movemachinetoanopenarea,awayfrompeople
and obstructions.
2.
turn the engine off and apply parking brake.
Drive machine to an open area, lower cutting decks,
1
CAUTION
2
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.
Figure 34
1.
2.
Forward traction port (faces forward)
Reverse traction port (faces rearward)
3.
Connect a 10,000 PSI (700 bar) pressure gauge to
traction circuit test port for function to be checked (for-
ward or reverse) (Fig. 34). Test ports are located on hy-
draulic lines toward the front of machine. Forward
traction port faces the front and reverse port faces rear-
ward.
2
RIGHT
FRONT
4.
After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5.
that traction speed is in the High (transport) range. Re-
lease parking brake.
Move throttle to full speed (2870 RPM). Make sure
3
1
6.
Siton seat,apply brakes fully andslowly depress the
traction pedal in the appropriate direction. While pu-
shing traction pedal, identify pressure reading on gauge
as relief valve opens:
Figure 35
3.
GAUGE READING TO BE:
Forward: 4800 to 5300 PSI (332 to 365 bar)
Reverse: 4800 to 5300 PSI (332 to 365 bar)
1.
2.
Forward relief valve
Reverse relief valve
Traction pump
7.
Release traction pedal and stop engine. Record test
results.
8.
If traction pressure is too low, makes sure that by-
pass valve on traction pump is fully seated and then in-
spect traction pump relief valves in piston (traction)
pump (Fig. 35). Clean or replace valves as necessary.
These cartridge type valves are factory set and are not
adjustable. If relief valves are in good condition, piston
(traction) pump, wheel motors and/or rear axle motor
should be suspected of wear and inefficiency.
Groundsmaster 4500--D/4700--D
Page 4 -- 45
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 30857, Toro Groundsmaster 30858, Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 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)