Toro Groundsmaster 4500-D Series Service Manual page 149

Procedure for Traction Circuit Charge Pressure Test
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Note: The traction charge circuit is designed to replace loss of hydraulic fluid
from the closed loop traction circuit.
Prevent personal injury and/or damage to equipment. Read all
WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the
beginning of this section.
1. Make sure hydraulic oil is at normal operating temperature by operating
the machine for approximately ten (10) minutes. Make sure the hydraulic
reservoir is full.
2. Park machine on a level surface with the cutting decks lowered and off. Make
sure hydraulic oil is at normal operating temperature, engine is OFF, the
parking brake is engaged and the hydraulic reservoir is full.
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1. Traction pump
2. Traction charge port
3. Raise hood and locate piston (traction) pump charge port plug on top of
pump (Figure 60). Thoroughly pump surfaces around plug to prevent system
contamination.
4. Remove plug from pump traction charge port and then install diagnostic test
fitting (K Line part number 59-7410) into charge port.
5. Connect a 70 bar (1000 PSI) pressure gauge onto diagnostic test fitting.
6. Start the engine and increase engine speed to high idle speed with no load
on the hydraulic system.
GAUGE READING TO BE 13.8 to 20.6 bar (200 to 300 PSI).
7. Stop engine and record test results.
8. If there is no pressure or pressure is low, check for the following:
A. Restriction in gear pump intake line.
B. Charge relief valve in piston pump is leaking (see
Service (page 5–107)).
C. If necessary, check for internal wear or damage in the third gear pump
section (see Gear Pump Flow (Using Tester with Pressure Gauge & Flow
Meter) (page 5–82)).
CAUTION
Figure 60
3. Diagnostic test fitting
Page 5–47
Piston (Traction) Pump
Hydraulic System: Testing