Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 57
Procedure for Cutting Deck Gear Pump Flow Test
NOTE: Overaperiodoftime,thegearsandwearplates
in the gear pump can wear. A worn pump w ill by--pass
oilandmakethepumplessefficient.Eventually,enough
oillosswilloccurtocausethecuttingdeckmotorstostall
under heavy cutting conditions. Continued operation
with a worn, inefficient pump can generate excessive
heat and cause damage to the seals and other compo-
nents in the hydraulic system.
IMPORTANT: Mowcircuit flowforthe Groundsmas-
ter 4100/4110 is approximately 16 GPM (61 LPM).
Use 40 GPM Hydraulic Tester #AT40002 (pressure
and flow) for this test (see Special Tools in this
chapter).
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineisoffandtheparking
brake is engaged.
CAUTION
Prevent personalinjury and/or damage to equip -
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Locate PTO control manifold for gear pump section
to be tested (front or LH manifold). Thoroughly clean
junction of manifold fitting and hydraulic hose at PTO
manifold port (P1) (Fig. 43). Disconnect hydraulic hose
from port (P1) fitting.
4. Install 40 GPM Hydraulic Tester #AT40002 (pres-
sureand flow) in series with the disconnected hose and
hydraulicmanifoldport(P1).Usehydraulichosekit(see
Special Tools in this chapter) to connect tester to ma-
chine.Make sure the flow control valveon the tester
is fully open.
5. After installing tester, start engine and run at idle
speed. Check for hydraulic leakage at tester location
and correct before proceeding with test.
6. Move throttle soengineisrunningathighidlespeed
(2870 RPM). Do not engage the cutting deck.
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. Watchpressuregauge carefullywhile slowlyclosing
the tester flow control valve until 2000 PSI is obtained.
Verifywithaphototacthattheenginespeedisstill2870
RPM.
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
8. Foragearpumpingoodcondition,pumpflowshould
be approximately 16 GPM (61 LPM). Fully open tester
flow control valve and shut off engine. Record test re-
sults.
9. If measured flow is less than 14 GPM (53 LPM) or
if a pressure of 2000 PSI cannot be obtained, check for
restrictioninthepumpintakeline.Iflineisnotrestricted,
remove gear pump and repair or replace as necessary.
10.When testing is complete, disconnect tester and
hosekitfrommanifoldportandmachinehydraulichose.
Reconnect machine hose to the manifold.
11.Repeat test for second cutting deck gear pump sec-
tion if required.
1. Center deck manifold
2. Hyd. hose to front P1
3. LH wing deck manifold
4. Hyd. hose to side P1
Figure 43
FRONT
RIGHT
TO OIL COOLER
1
4
2
3
Hydraulic
System
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