Toro 03781, Service Manual

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Reelmaster 7000−D Hydraulic System Page 5 − 83
Gear Pump Sections P2 thru P5 Flow Test
A gear pump flow test should be performed to make sure
a hydraulic circuit has adequate fluid flow. Four (4) gear
pumps are used in the Reelmaster 7000−D to power the
various hydraulic circuits (Fig. 45). Gear pump section
P2 provides hydraulic flow for the front cutting units #1,
#4, & #5.Gear pump section P3 provides hydraulic flow
for the rear cutting units #2 & #3. Gear pump section P4
provides hydraulic flow for the steering, lift/lower and
charge circuits. Gear pump section P5 provides hydrau-
lic flow for the engine cooling fan circuit.
The gear pump flow test compares fluid flow at No Load
with fluid flow Under Load. A drop in flow under load of
more than 15% indicates the gears and wear plates in
the pump have worn. A worn pump will by−pass hydraul-
ic fluid and make the pump less efficient. Eventually,
enough fluid loss will occur to cause the cutting unit mo-
tors to stall under heavy cutting conditions. Continued
operation with a worn, inefficient pump can generate ex-
cessive heat and cause damage to the seals and other
components in the hydraulic system.
Special Equipment Required:
S
15 GPM (56 LPM) Hydraulic Tester (Pressure
and Flow) with hoses − 1−3/16 − 12 (P2 & P3), 13/16
− 16 (P4 & P5)
S
Phototach (non−contact tachometer)
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 the reel enable/disable switch in the DIS-
ABLE position. Make sure engine is off and the parking
brake is applied.
IMPORTANT: Make sure that the oil flow indicator
on the tester matches the flow of oil (gear pump >
tester > manifold).
2. Determine which gear pump section is to be tested
and install the hydraulic tester in series with the discon-
nected hose and hydraulic fitting at the appropriate loca-
tion:
A. Gear Pump P2 − Front Cutting Unit Circuit: dis-
connect hydraulic hose at top of gear pump section
P2 or at mow control manifold port P1.
1. Gear pump section P2
(front cutting units)
2. Gear pump section P3
(rear cutting units)
3. Gear pump section P4
(steering/lift/charge)
4. Gear pump section P5
(engine cooling fan)
Figure 45
4
FRONT
RIGHT
3
2
1
B. Gear Pump P3 − Rear Cutting Unit Circuit: dis-
connect hydraulic hose at top of gear pump section
P3 or at mow control manifold port P2.
C. Gear Pump P4 − Steering/Lift/Charge Circuit:
disconnect hydraulic hose at top of gear pump sec-
tion P4 or at fan control manifold port P2.
D. Gear Pump P5 − Engine Cooling Fan Circuit: dis-
connect hydraulic hose at top of gear pump section
P5 or at fan control manifold port P1.
3. Make sure the flow control valve on tester is fully
open.
4. Start engine and run at low idle speed. Check for hy-
draulic leaks at tester connections and make correc-
tions if necessary before 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. Make sure the hydraulic reservoir is full.
7. Verify pump flow at No Load as follows:
Record tester pressure and flow reading at no load
(Fig. 46).
Hydraulic
System