Procedure for Cutting Deck Gear Pump Flow Test
8. Flow indication should be approximately 14 GPM.
NOTE: Overaperiodoftime,thegearsandwearplates
in the pump can wear. A worn pump will by pass oil and
makethepumplessefficient.Eventually,enoughoilloss
will occur to cause the cutting unit motors to stall under
heavy cutting conditions. Continued operation with a
worn, inefficientpump can generate excessive heatand
causedamage tothe seals and othercomponents inthe
hydraulic system.
9. Shut off engine.
10.Disconnect
flowtesterfromhydraulic hoseandman-
ifold port. Reconnect hose to the manifold.
11.
If flow was less than 14 GPM or a pressure of 2000
PSIcannotbeobtained,checkforrestrictioninthepump
intake line. If line is not restricted, remove gear pump
and repair or replace as necessary.
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
RIGHT
2.
Parkmachineonalevelsurfacewiththecuttingunits
FRONT
lowered and off. Make sure engine is off and the parking
brake is engaged.
3
CAUTION
2
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.
4
1
Figure 21
3.
tested. Disconnect hydraulic hose at deck manifold port
(P1) (Fig. 21).
Locate deck manifold for gear pump section to be
1.
2.
Front deck manifold
Hyd. hose to front P1
3.
4.
Side deck manifold
Hyd. hose to side P1
4.
Installtesterinserieswiththethedisconnected hose
and hydraulic manifold port (P1).
5.
Make sure the flow control valve on the tester is fully
open.
6.
30
Start engine and move throttle to full speed (2730 +
RPM). Do not engage the cutting units.
IMPORTANT: Do not fully restrict oil flow through
tester. In this test, the flow tester is positioned be-
fore the relief valve. Pump damage can occur if the
oil flow is fully restricted.
7.
Watch pressure gauge carefully while slowly closing
the flow control valve until 2000 PSI is obtained. Verify
with a phototac that the engine speed is 2730 + 30
RPM.
Groundsmaster 4000--D
Page 4 -- 31
Hydraulic System (Rev. B)
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Groundsmaster 4000 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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