Toro Groundsmaster 4100-D Service Manual page 97

Procedure for Steering Circuit Relief Pressure Test
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. Park machine on a level surface with the cutting deck
lowered and off. Make sure engine is off and the parking
brake is engaged.
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. Connect a 5000 PSI (350 bar) pressure gauge onto
steering circuit pressure test port (Fig. 44).
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage at pressure
gauge location and correct before proceeding with test.
5. Move throttle so engine is running at high idle speed
(2870 RPM).
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
Holding the steering wheel against the stop for an
extended period may damage the steering control
valve.
6. Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
GAUGE READING TO BE 1300 to 1400 PSI (90 to
96 bar).
7. Stop the engine and record test results.
8. If pressure is incorrect, inspect steering relief valve
in control valve (see Steering Control Valve in the Ser-
vice and Repairs section of this chapter). If steering re-
lief valve is operating properly and if lift/lower problems
also exist, gear pump should be suspected of wear and
inefficiency. If steering wheel continues to turn at end of
cylinder travel (with lower than normal effort), steering
cylinder or steering control valve should be suspected
of wear or damage.
9. When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4100--D/4110--D
1. Steering circuit pressure test port
Page 4 - - 59
1
Figure 44
Hydraulic System