Test No. 7: Gear Pump Section (P3) Flow And Relief Valve Pressure - Toro Reelmaster 5500-D Service Manual

TEST NO. 7: Gear Pump Section (P3) Flow and Relief Valve Pressure

(Using Tester with Pressure Gauges and Flow Meter)
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.
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 in series between pressure hose and the gear
pump section P3 (Fig. 22). Make sure the tester flow
control valve is OPEN.
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 (3000 RPM). DO
NOT engage the cutting units.
5. While watching pressure gauges, slowly close flow
control valve until 1000 PSI (69 bar) is obtained on
gauge. Verify pump speed at 3000 RPM at the transmis-
sion input shaft from the engine.
TESTER READING: Flow not less than 4 GPM at 1000
PSI (69 bar).
6. If flow was lower than 4 GPM or a pressure of 1000
PSI (69 bar) cannot be obtained, check for restriction in
pump intake line. If not restricted, verify relief setting
first, then remove pump and repair or replace as neces-
sary.
7. While watching pressure gauges, slowly close flow
control valve further until 1450 PSI (100 bar) is main-
tained as the relief valve lifts.
TESTER READING: Relief valve setting of 1450 PSI
(100 bar).
Hydraulic System (Rev. C)
CAUTION
1. Outlet to steering
1. Gear pump
8. If pressure is maintained below 1450 PSI (100 bar)
or pressure goes beyond 1450 PSI (100 bar), replace
the relief valve (Fig. 23).
9. Stop engine. Remove tester and reinstall hoses.
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Figure 22
2. Gear pump
1
Figure 23
2. Relief valve
Reelmaster 5500-D
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2