Loader Bobcat 853, 853H. Manual - part 20

HYDRAULIC CONTROL VALVE (Cont’d)

Removal And Installation (Cont’d)

Remove the control valve outlet tubeline (Item1) [A] from
the control valve.

Remove the power beyond tubeline which goes to the
auxiliary control valve inlet [B].

Disconnect the control valve inlet hose (Item 1) [B] which
comes from the outlet of the hydraulic pump.

Disconnect the two connectors from the solenoids on the
auxiliary section of the control valve [C].

Remove the two mounting bolts and remove the control
valve [D].

Installation: Tighten the mounting bolts to 25 ft.–lbs. (34
Nm) torque.

SEE THE COMPONENT REPAIR MANUAL FOR THE
HYDRAULIC CONTROL VALVE FOR THE
DISASSEMBLY AND ASSEMBLY PROCEDURE.

A

CD–10941

1

C

CD–10943

D

CD–10944

853, 853H BICS Loader

–2–29–

Service Manual

B

CD–10942

1

SELECT VALVE (S/N 512811001 & Above) W/Select
Valve (JEM)

Checking The Relief Valve

The tools listed will be needed to do the following
procedure:

MEL10003 – Hydraulic Tester
MEL10006 – Hydraulic Test Kit

Lift and block the loader. (See Page 1–1.)

Connect the IN port of the hydraulic tester to the female
quick couplers (Item 1) [A] on the loader.

Connect the OUT port of the hydraulic tester to the male
quick coupler (Item 2) [A] on the loader.

The hydraulic tester must be in the fully open
position before you start the engine.

I–2024–0284

W–2017–0286

Put jackstands under the front axles and rear

corners of the frame before running the engine

for service. Failure to use jackstands can allow

the machine to fall or move and cause injury or

death.

Start the engine and run at low idle RPM. Push the mode
switch (Item 1) [B] once (on the instrument panel) to
engage the front auxiliary hydraulics momentary, the light
(Item 2) [B] will come ON.

Push the rocker switch (Item 3) [B] for fluid pressure to
the secondary quick couplers.

Watch the flow meter on the hydraulic tester to make sure
the flow is correct. Increase the engine speed to full RPM.

The free flow should be approximately 8.0 GPM (30,3
L/min.). Turn the restrictor control, on the tester, until the
main relief valve opens. The correct pressure for the main
relief is approximately 3000 PSI (20685 kPa).

Release the rocker switch (Item 3) [B] to disengage the
flow to the secondary quick couplers.

A

P–04761

2

1

–2–30–

853, 853H BICS Loader

Service Manual

B

P–00998

1

2

Left

Steering

Lever

Control

3

P–02130

SELECT VALVE (S/N 512811001 & Above) W/Select
Valve (JEM) (Cont’d)

Checking The Relief Valve (Cont’d)

If the relief pressure is not correct, stop the engine. Adjust
the relief valve in the select valve (Item 1) [A]. The select
valve is located at the left side under the control panel.

Remove the cap from the relief valve (Item 1) [B]. Loosen
the locking nut (Item 2) [B]. Turn the adjusting screw
(Item 3) [B] in or out until the correct pressure is reached.
If the correct pressure is not reached remove the relief
valve and inspect the O–rings and back–up rings (Item 4)
[B]. Replace the relief valve if required.

A

P–05201

1

853, 853H BICS Loader

–2–31–

Service Manual

B

P–05200

1

4

2

3

P–09199

SELECT VALVE (S/N 512811001 & Above) W/Select
Valve (JEM) (Cont’d)

Removal And Installation

Raise the operator cab. (See Page 1–1.)

Remove the bolt (Item 1) [A].

Disconnect the controls harness at the left side steering
lever connectors (Item 2) [A].

If so equipped disconnect the attachment harness from
the controls harness and the left side steering lever
connectors. Put the relay assembly (Item 3) [A] and
attachment harness aside.

Remove the front mount nut and steering panel brace
(Item 4) [A].

Disconnect the controls harness from the select valve
connectors (Item 1) [B].

Remove the rear bolt (Item 2) [B] on the left side pedal link
(Item 3) [B].

Remove the link front bolt and push the link (Item 3) [B]
forward.

Disconnect and remove the tubeline (Item 1) [C].

Disconnect and lower the tubeline (Item 2) [C].

Disconnect the tubeline (Item 3) [C].

Disconnect the hose (Item 4) [C].

Disconnect the tubelines (Item 1) [D] at the select valve.

Install caps and plugs on open connections.

Remove the select valve.

Installation: Connect controls harness to select valve
solenoids. Refer to the Electrical Wiring Diagram for the
correct controls harness wire colors.

A

P–09185

2

4

2

3

1

C

P–09187

4

3

2

1

D

P–09186

1

–2–32–

853, 853H BICS Loader

Service Manual

B

P–09189

3

1

1

2