Pressure Test - Toro Reelmaster 7000-D Service Manual

Traction Circuit − Reverse Reducing Valve (PR)

Pressure Test

When in reverse, pressure reducing valve (PR) located
in the rear traction manifold limits the pressure to the
rear axle motor to 450 PSI (31 bar) so the rear wheels
will not scuff the turf. Check the pressure reducing valve
(PR) pressure if the rear wheels are scuffing the turn in
reverse (setting too high) of if poor traction performance
when in reverse is suspect (setting too low or too close
to rear relief valve (RV) setting).
Special Equipment Required:
S Pressure Gauge − 1000 PSI (70 bar) with hose
S Diagnostic Fitting w/Cap − 9/16 − 18
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. Park machine on a level surface with the cutting units
lowered and disengaged. Make sure engine is off and
the parking brake is engaged.
NOTE: The #6 zero leak plug on the rear traction mani-
fold has a tapered sealing surface on the plug head.
Lightly rap the plug head using a punch and hammer be-
fore using an allen wrench to remove the plug. The im-
pact will allow plug removal with less chance of damage
to the socket head of the plug.
2. The rear traction manifold is attached to the frame
near the left front wheel motor (Fig. 36). Remove the #6
zero leak plug from the unmarked port located between
ports M8 and P2 and install a diagnostic fitting.
3. Connect a 1000 PSI (70 bar) pressure gauge with hy-
draulic hose attached to installed diagnostic fitting. The
pressure gauge hydraulic hose must be long enough to
safely view the pressure gauge while sitting in the opera-
tor'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).
Reelmaster 7000−D
1 2
FRONT
1. Rear traction manifold
2. Unmarked port
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 LOW speed (mow) position, release the parking
brake and apply the brakes. Slowly depress the traction
pedal in the reverse direction. Note pressure reading on
gauge as relief valve opens.
GAUGE READING TO BE:
420 to 470 PSI (29 to 32 bar)
8. Release traction pedal, set parking brake, and stop
engine. Record test results.
9. The pressure reducing valve (PR) is located on the
bottom of the rear traction manifold (Fig. 36). If test pres-
sure is incorrect, adjust pressure reducing valve (PR)
(see Adjust Control Manifold Relief Valves in this chap-
ter). Recheck pressure reducing valve pressure after
any adjustment.
NOTE: The rear traction circuit relief valve (RV) pres-
sure test uses the same connection as the traction cir-
cuit pressure reducing valve (PR) pressure test. If
necessary, conduct the rear traction circuit relief valve
(RV) pressure test before removing pressure gauge
from rear traction manifold.
10.When testing is completed, disconnect pressure
gauge and hose. Leave the diagnostic fitting installed for
future testing and reverse towing bypass. install a diag-
nostic fitting cap to protect the fitting and prevent system
contamination.
Page 5 − 55
3
Figure 36
3. Reducing valve (PR)
Hydraulic System