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Steering Control Unit

1600 SRM 974

1.

CAPSCREW

2.

MOUNTING CAP

3.

DUST SEAL

4.

PRESSURE SEAL

5.

THRUST RACE

6.

THRUST BEARING

7.

DRIVE PIN

8.

O-RING

9.

GEROTOR

10. HOUSING
11. O-RING
12. TANK PLUG

Figure 3. Steering Control Unit (Before May 2002)

Disassemble (After May 2002)

1.

Put the control unit in a vise with soft jaws. See
Figure 2. Scribe (mark) a line across housing,
gerotor, and end cap. This is done so the unit
can be reassembled by aligning the marks. It is
critical to reassemble the SCU correctly because
there are holes drilled into the different parts to
allow oil to circulate through the SCU.

NOTE:

Refer to Figure 4 for the following instruc-

tions.

2.

Remove the capscrews that hold down the end
cap and remove the end cap.

3.

Remove both O-rings, the spacer, and seal ring
from the end cap. Carefully clean and inspect all
surfaces of the end cap.

4.

Remove the gerotor. Carefully clean and inspect
all surfaces of the gerotor.

5.

Remove drive shaft.

6.

Remove wear plate and O-ring. Carefully clean
and inspect all surfaces of the wear plate.

7.

Remove O-ring from housing.

NOTE:

The manual steering check valve may be a

check ball or a check/relief valve.

8.

Remove the plug and manual steering check
valve.

9.

Remove the spool and sleeve from the housing.
See Figure 5.

4

Содержание MAST N45XMXR3

Страница 1: ...Hyster G138 N30XMDR3 N45XMR3 Forklift...

Страница 2: ...67 5 1 6 67 0 N25XMDR3 N30 40XMR3 C470 N50XMA3 C471 N30XMDR3 N45XMR3 G138 N30XMXDR3 N45XMXR3 B264 PART NO 1503624 1600 SRM 974...

Страница 3: ...condition Always use HYSTER APPROVED parts when making repairs Replacement parts must meet or exceed the specifications of the original equipment manufacturer Make sure all nuts bolts snap rings and...

Страница 4: ...Motor 9 Remove and Disassemble 9 Assemble and Install 9 Pump 10 Remove 10 Install 11 Disassemble 11 Assemble 12 Axle Assembly Repair 12 General 12 Traction Motor 12 Description 12 Remove 12 Install 13...

Страница 5: ...ore information Please click here Then get the complete manual NOTE If there is no response to click on the link above please download the PDF document first and then click on it Have any questions pl...

Страница 6: ...ts Steering System TABLE OF CONTENTS Continued Steering Pressure 20 Troubleshooting 22 This section is for the following models N25XMDR3 N30 40XMR3 C470 N50XMA3 C471 N30XMDR3 N45XMR3 G138 N30XMXDR3 N4...

Страница 7: ...steering system draws hydraulic oil from the same hydraulic tank used by the mast and reach as sembly The hydraulic oil is directed to the SCU by the power steering pump This gear pump has a pri orit...

Страница 8: ...on between the steer ing disk and the steering axle The steering is con trolled through a hydraulic circuit If the steering pump fails to operate a check valve permits the Steering Control Unit SCU to...

Страница 9: ...repairs always protect machined sur faces NOTE Before disassembly drain the oil plug the ports and thoroughly clean the exterior of the SCU Put the control unit in a vise with soft jaws See Figure 2...

Страница 10: ...o the different parts to allow oil to circulate through the SCU NOTE Refer to Figure 4 for the following instruc tions 2 Remove the capscrews that hold down the end cap and remove the end cap 3 Remove...

Страница 11: ...6 THRUST BEARING 7 SPRING RETAINING RING 8 CENTERING SPRINGS 9 SPOOL 10 SLEEVE 11 DRIVE PIN 12 PLUG 13 O RING 14 CHECK BALL 15 CHECK RELIEF VALVE 16 WEAR PLATE 17 DRIVE SHAFT 18 SPACER 19 GEROTOR 20...

Страница 12: ...pry the dust seal from the housing 13 Remove the drive pin 14 Carefully slide the spool out of the sleeve The springs and retaining ring will stay with the spool as it s removed CAUTION The centering...

Страница 13: ...ove the sleeve and bearing race 2 Lubricate and install the dust seal 3 Install the centering springs in the spool It is best to install the two flat pieces first Next in stall the curved pieces three...

Страница 14: ...r Steering Pump and Motor Assembly DESCRIPTION This pump and motor also supply oil for the aux iliary hydraulic functions The steering pump and motor assembly are fastened to the lift truck frame The...

Страница 15: ...70 and DC Motor Repair 620 SRM 294 for additional information for inspection of the brushes and commutator 6 If the motor must be disassembled for cleaning or repairs remove the pump so a new oil seal...

Страница 16: ...he blocks from both sides of the drive steer tire caster wheels and the load wheels PUMP Remove 1 Disconnect the battery Block the drive tire caster wheels and load wheels on both sides to prevent mov...

Страница 17: ...seal 3 Mark the flange pump body and load sensing valve assembly for orientation during assembly 4 Remove the four capscrews from the pump body Separate the mounting flange and the end cover from the...

Страница 18: ...ng motor and the caster The trac tion motor fastens to the top of the MDU near the left end of the axle weldment The MDU is fastened to the bottom of the weldment and rotates on a large bearing The tr...

Страница 19: ...luid that is on a painted sur face 6 Remove the cap from the hose assembly Con nect the hose assembly to the slave cylinder Add brake fluid to the reservoir with the recom mended brake fluid Remove th...

Страница 20: ...screws have been initially tightened tighten the capscrews to 78 N m 58 lbf ft NOTE If the chain anchor came off the MDU hous ing install the chain anchor at the mark made dur ing removal 4 If the tru...

Страница 21: ...in anchor of the steering chain 2 Disconnect the battery Open the drive unit compartment cover Block the drive steer tires caster wheels and load wheels on both sides to prevent movement of the lift t...

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