Test No. 4: Gear Pump Section (P1 & P2) Flow - Toro Reelmaster 5500-D Service Manual

TEST NO. 4: Gear Pump Section (P1 & P2) Flow
(Using Tester with Pressure and Flow Capabilities)
Over a period of time, the gears and wear plates in the
pump can wear. A worn pump will by-pass oil and make
the pump less efficient. Eventually, enough oil can by-
pass to cause the reels to stall in heavy cutting condi-
tions. Continued operation with a worn, inefficient pump
can generate excessive heat and cause damage to
seals and other components in the hydraulic system.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
2. Make sure machine is parked on a level surface with
the cutting units lowered and off. Make sure engine is
off.
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.
3. With the engine off and cutting units lowered, install
tester with pressure gauges and flow meter in series be-
tween pressure hose and reel manifold block fitting (Fig.
18) or between pressure hose and pump fitting (Fig. 19)
for suspected bad pump section. Make sure the tester
flow control valve is OPEN.
Front circuit - port P1 (rear pump section-shaft end)
Rear circuit - port P2 (center pump section)
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow from the pump, through the tester and into the
valve block.
IMPORTANT: The pump is a positive displacement
type. If pump flow is completely restricted or
stopped, damage to the pump, tester or other com-
ponents could occur.
4. Make sure the parking brake is engaged. Start the
engine and move throttle to full speed (3200 RPM). DO
NOT engage the cutting units.
Reelmaster 5500-D
2
1. Hose to port P1
1. Rear pump section
5. While watching pressure gauges, slowly close the
tester flow control valve until 2000 PSI (138 bar) is ob-
tained on gauge.
TESTER READING: Flow not less than 7 GPM at 2000
PSI (138 bar).
6. Stop the engine. If flow was lower than 7 GPM or a
pressure of 2000 PSI (138 bar) cannot be obtained,
check for restriction in pump intake line. If not restricted,
remove pump and repair or replace as necessary.
Page 4 - 31
1
Figure 18
2. Hose to port P2
1 2
Figure 19
2. Center pump section
Hydraulic System (Rev. C)