Toro Greensmaster TriFlex 3300 Service Manual page 103

The mow circuit relief valve pressure test should be per-
formed to make sure that the relief pressure for the mow
circuit is correct.
Procedure for Mow Circuit Relief Valve Pressure
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Park machine on a level surface with the cutting units
lowered. Make sure engine is off and the parking brake
is engaged. Make sure the hydraulic tank is full.
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. Thoroughly clean junction of hydraulic hose and
front fitting on the left front cutting reel motor (#2 cutting
unit) (Fig. 28). Disconnect hose from motor fitting.
4. Install hydraulic tester (pressure and flow) in series
with the disconnected hose and the motor fitting. Make
sure that tester flow arrow points from the disconnected
hose and toward the motor. Also, make sure flow con-
trol valve on the tester is fully open.
5. To prevent reel damage, temporarily adjust bedknife
on all cutting units to allow clearance between bedknife
and reel (no contact).
6. Make sure backlap lever on the mow control man-
ifold is in the mow position and reel speed knob (FC) is
set to highest speed setting (fully open).
CAUTION
Keep away from reels during test to prevent per-
sonal injury from the rotating reel blades.
7. After hydraulic tester has been connected, start en-
gine and run at low idle speed. Check for hydraulic leak-
age and correct before proceeding with test.
8. Move throttle so engine is running at high idle speed.
Engage the cutting units.
9. Watch pressure gauge carefully while slowly closing
the flow control valve on the tester to fully closed.
Greensmaster 3300/3400
10.As relief valve opens, system pressure should be
from 2700 to 3300 PSI (186 to 227 bar). Record test re-
sults.
11. Disengage cutting units. Open control valve on test-
er and shut off engine.
12.If relief valve specification is not met, remove pro-
portional relief valve (PRV) on mow control manifold
(Fig. 29). Clean or replace valve (see Hydraulic Manifold
Service in the Service and Repairs section of this chap-
ter). Retest mow circuit relief valve pressure after servic-
ing valve.
13.When testing is complete, disconnect tester from
reel motor fitting and hose. Connect hydraulic hose to
the reel motor.
14.Adjust reel speed knob (FC) on mow control man-
ifold to original setting. Correctly adjust bedknife on all
cutting units.
2
1. #2 reel motor
2
FRONT
1. Mow control manifold
Page 5 - - 51
1
Figure 28
2. Front fitting
Figure 29
2. Proportional relief valve
Hydraulic System
1