Servicing - wsm L503 Workshop Manual

L3130 · L3430 · L3830 · L4630 · L5030, WSM
(B) Disassembling Hydraulic Pump

(3) Servicing

Hydraulic Pump Assembly
1. Remove the pump cover mounting screws (7).
2. Remove the drive gear (6), driven gear (2) and side plate (3) from
the casing.
(When reassembling)
• Take care not to damage the gasket.
• Align the hole of the pump cover (5) and casing 2 (4).
• Install the side plate, noting its location and direction.
• Install the gears, noting its direction.
Pump cover mounting
Tightening torque
screw
(1) Casing 1
(2) Driven Gear
(3) Side Plate
(4) Casing 2
Hydraulic Pump Running-In
After reassembly, perform break-in operation in the following
manner, and check the pump for abnormality before use. If the
pump temperature should rise noticeably during running-in, recheck
should be performed.
1. Install the hydraulic pump to the tractor, and mount the suction
pipe and delivery pipe securely.
2. Set the engine speed at 1300 to 1500 min
the hydraulic pump at no load for about 10 minutes.
3. Set the engine speed at 2000 to 2200 min
hydraulic pump applied with 2.94 MPa (30 kgf/cm
2
4.90 MPa (50 kgf/cm
15 minutes.
4. With the engine set to maximum speed, fully turn the steering
wheel to the left or right, then actuate the relief valve five times
for 25 seconds (one time 5 seconds).
Housing Bore (Depth of Scratch)
1. Check for the scratch on the interior surface of the housing
caused by the gear.
2. If the scratch reaches more than half the area of the interior
surface of the housing, replace at pump assembly.
3. Measure the housing I.D. where the interior surface is not
scratched, and measure the housing I.D. where the interior
surface is scratched.
4. If the values obtained in the two determinations differ by more
than the allowable limit, replace the hydraulic pump as a unit.
Depth of scratch Allowable limit
(Reference)
• Use a cylinder gauge to measure the housing I.D.
8-S9
HYDRAULIC SYSTEM
39.2 to 44.1 N·m
4.0 to 4.5 kgf·m
28.9 to 32.5 ft-lbs
(5) Pump Cover
(6) Drive Gear
(7) Screw
−1
(rpm), and operate
−1
(rpm), and with the
, 711 psi) pressure, operate it for approx.
0.09 mm
0.0035 in.
KiSC issued 02, 2007 A
W10135590
2
, 427 psi) to
W10145360
W10146490