Toro 03781, Service Manual

Page: 115 / 468

Reelmaster 7000−D Hydraulic System Page 5 − 45
Traction Circuit − Relief Pressure Test
Special Equipment Required:
S
Pressure Gauge − 10,000 PSI (700 bar) with
hose
S
Phototach (non−contact tachometer) for units
with Kubota diesel engine
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.
1. Drive machine to an open area, lower cutting units,
turn the engine off and apply parking brake.
2. Locate traction circuit test port for function to be
checked (FORWARD or REVERSE). Test ports are lo-
cated on hydraulic lines near the right front wheel motor
(Fig. 31). FORWARD traction test port faces the front
and REVERSE test 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). The pressure gauge hydraulic
hose must be long enough to safely view the pressure
gauge while sitting in the operator’s seat.
4. Start engine and run at low idle speed. Check for hy-
draulic leakage and make corrections if necessary be-
fore proceeding with test.
5. Set throttle to high speed.
A. Use the InfoCenter display to verify engine RPM
on units with Yanmar diesel engines (2850 RPM).
B. Use a phototach to verify engine RPM on units
with Kubota diesel engines (2850 +50/−120 RPM).
6. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
7. Sit in the operator’s seat, set the mow speed limiter
to the HI speed (transport) position, release the parking
brake and apply the brakes. Slowly depress the traction
pedal in the appropriate direction (forward or reverse).
Note pressure reading on gauge as relief valve opens.
GAUGE READING TO BE:
Forward: 4800 to 5300 PSI (332 to 365 bar)
Reverse: 4800 to 5300 PSI (332 to 365 bar)
1. FORWARD test port 2. REVERSE test port
Figure 31
2
1
FRONT
RIGHT
1. Forward relief valve
2. Reverse relief valve 3. Traction pump
Figure 32
2
3
FRONT
RIGHT
1 1
8. Release traction pedal, set parking brake, and stop
engine. Record test results.
9. If pressure is too low, make sure that bypass (tow)
valve in traction pump is fully seated.
10.If traction pressure is too low, inspect traction pump
relief valves (Fig. 32). These cartridge type valves are
factory set and are not adjustable. Clean or replace
valves as necessary.
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.
If relief valves are in good condition, piston (traction)
pump, wheel motors and/or rear axle motor should be
tested for wear and efficiency.
11. When testing is completed, disconnect pressure
gauge from test port and install dust cap.
Hydraulic
System