Servicing - wsm L503 Workshop Manual

L3130 · L3430 · L3830 · L4630 · L5030, WSM

(3) Servicing

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.
Clearance between Bushing and Gear Shaft
1. Measure the gear shaft O.D. with an outside micrometer.
2. Measure the bushing I.D. with an inside micrometer or cylinder
gauge, and calculate the clearance.
3. If the clearance exceeds the allowable limit, replace the gear
shaft and the bushings as a unit.
Factory spec.
Clearance between
bushing and gear shaft
Allowable limit
Gear shaft O.D. Factory spec.
Bushing I.D. Factory spec.
7-S10
−1
(rpm), and operate
−1
(rpm), and with the
, 711 psi) pressure, operate it for approx.
0.09 mm
0.0035 in.
0.020 to 0.081 mm
0.0008 to 0.0032 in.
0.15 mm
0.0059 in.
14.970 to 14.980 mm
0.5894 to 0.5898 in.
15.000 to 15.051 mm
0.5906 to 0.5926 in.
STEERING
2
, 427 psi) to
W10145360
W10146490
W1015746
KiSC issued 02, 2007 A