Index

Char-Lynn

®

Hydraulic Motor

Repair Information

4000 Compact Series
Di s c Val ve Gerol er Motor

001

4000 Compact Series Disc Valve Motors

Seal

Shaft
Face Seal
Bearing and
Shaft
Assembly

Shaft
Seal
Bearing
Housing

Geroler

Splined
Drive
Wear Seal
Plate

Key

Back-up
Washer

Valve
Drive

Seal
Exclusion
Seal
Seal
Guard

Spring

ValveHousing

Outer
Face Seal

Tie
Bolt

Balance
Ring

Seal
Valve

O-ring/
Plug S/A

Pin
Inner
Face Seal
Tools required for disassembly and reassembly.
Torque wrench 57Nm [500 lb-in] capacity
300 - 450 mm [12 - 16 inch ]* breaker bar
9/16 socket
Small screwdriver 150-200 L x 6,5 W [6-8 L x 1/4 W] blade
3/16 Allen wrench
Press
Shaft Bullet (600465) 1–1/4 inch or 32 mm shafts
*Unless indicated otherwise, measurements
are given in mm [inches]

** Shaft seal installation tool (600496) 1–1/4 inch or 32 mm shafts
** Shaft seal installation tool (600421-2) 1–1/2 inch or 40 mm shafts
The following tools are not necessary for disassembly and reassembly, but are extremely helpful.

Alignment studs (2)
200,0 [8.00]
25,0 [1.00]

Approx. 13,0 [.50]

8,0 [.312]

9,5[.375] Dia. Steel Rod
3/8-24 UNF thread
Grind flat spots on each side

2

Valve
Plate

4000 Compact Series Disc Valve Motors

Disassembly
that you keep the motor in the vise during disassembly and reas-

Alignment studs (2)
Cleanliness is extremely important when repairing a hydraulic motor.
Work in a clean area. Before disconnecting the lines, clean the port
area of the motorthoroughly. Use a wire brush to remove foreign
material and debris from around the exterior joints of the motor.
Check the shaft and key slot, remove all nicks, burrs or sharp edges
that might damage the bearing housing seals when installing the shaft

Figure 3

sembly. Follow the clamping procedures explained throughout the
manual.

Figure 1

and bearing assembly. Before starting thedisassembly procedures,
drain the oil from inside the motor.
1 Place the motor in a vise with the output shaft down. Clamp
across the mounting flange of the motor not the housing. Excessive
clamping pressure will cause distortion. When clamping, use some
protective device on the vise, such as special soft jaws, pieces of hard
rubber or board.

Seal

Case Drain Plug

Seal
Figure 4Although not all drawings show the motor in a vise, we recommend

2 Remove 4 bolts from motor.
3 Lift valve housing straight up. If done carefully the pins, springs,
balance ring assembly, and valve will remain on the valve plate.
4 Carefully remove 76,0 [3.00] diameter seal from valve housing.

Tie Bolts

5 Remove case drain plug—with seal, from valve housing.
6 Remove 2 pins and 2 springsfrom balance ring assembly, see
Figure 5.

Figure 2

3

4000 Compact Series Disc Valve Motors

Disassembly
Outer Face Seal

15 Remove the 76,0 [3.00] diameter seal from wear plate,
see Figure 7.

Bearing
Housing

Seal

Wear
Plate

Pin (2) and
Spring (2)
Inner
Face Seal
Valve

Shaft Face Seal

Balance Ring

Figure 5

Figure 8

7 Remove balance ring assembly.16 Remove the wear plate.

8 Remove inner and outer face seals from balance ring.

17 Remove the shaft face seal from the wear plate.

9 Remove the valve.

18 Remove the 76,0 [3.00] diameter seal from bearing housing.

Valve Drive

Bearing
Housing

Seal

Shaft and
Bearing
Assembly

Valve Plate
Figure 9

Figure 6
19 You may need a press to remove shaft and bearing assemblyfrom
bearing housing. (Key must be removed before removing shaft.)
10 Remove the valve plate.
11 Remove the 76,0 [3.00] diameter seal from valve plate.

Bearing Housing

12 Remove the valve drive.

Shaft Seal

Exclusion
Seal

Seal

Back-up Washer

Seal

Geroler
Figure 10

Figure 7
13 Remove the Geroler. Be sure to retain the rollers in the outer ring
if they are loose....