Toro Reelmaster 7000-D Service Manual page 117

Traction Circuit − Piston (traction) Pump Flow Test
This test compares fluid flow at No Load with fluid flow
Under Load. A drop in flow under load of more than 12%
indicates an internal leak or malfunctioning relief valve
in the piston (traction) pump. A worn piston pump or mal-
functioning relief valve is less efficient. Eventually,
enough fluid by−pass will cause the unit to stall under
heavy load conditions. Continued operation can gener-
ate excessive heat, cause damage to seals and other
components in the hydraulic system, and affect overall
machine performance.
Special Equipment Required:
S 40 GPM (151 LPM) Hydraulic Tester (Pressure
and Flow) with hoses − 1−7/16 − 12
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.
WARNING
Before jacking up the machine, review and follow
Jacking Instructions in Chapter 1 − Safety.
2. Raise and support machine so all wheels are off the
ground (see Jacking Instructions in Chapter 1 − Safety
in this manual).
3. Thoroughly clean junction of hydraulic hoses and fit-
tings on bottom of piston (traction)
4. Disconnect hose from left side fitting on bottom of
piston (traction) pump (forward port) (Fig. 33).
IMPORTANT: Traction circuit flow for the Reelmas-
ter 7000−D is approximately 35 GPM (133 LPM). Use
a Hydraulic Tester (pressure and flow) with a
40 GPM or larger capacity for this test (see Special
Tools in this chapter).
Reelmaster 7000−D
5. Install 40 GPM Hydraulic Tester between piston
pump left side fitting and disconnected hose. Use hy-
draulic hose kit (see Special Tools in this chapter) so
tester can be easily viewed and operated from along-
side machine. Make sure that hydraulic connections are
properly tightened and the tester flow control valve is ful-
ly open.
6. Make sure the traction pedal and linkage are proper-
ly adjusted for neutral (see traction unit Operator's Man-
ual).
7. Start engine and run at low idle speed. Check for hy-
draulic leakage and make corrections if necessary be-
fore proceeding with test.
pump.
8. Set throttle to high speed.
9. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
10.Sit in the operator's seat, set the mow speed limiter
to the HIGH speed (transport) position, and release the
parking brake.
Page 5 − 47
LEFT
FRONT
Figure 33
1. Piston (traction) pump
CAUTION
Use extreme caution when performing piston
pump flow tests. The traction unit wheels will be
rotating during the test .
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).
1
2
2. Left hose (forward port)
Hydraulic System