R1700 Load Haul Dump Power Train, Steering, Braking, Hydraulic, and Machine Systems Caterpillar

Lift and Tilt Cylinder Speed - Check

Usage:

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Personal injury or death can result from sudden movement of the lift or tilt cylinders.
Sudden movement up or down, can cause the clearance above your head to change rapidly.
Do not stand under the lift arms when testing and adjusting the lift cylinders.

Do not stand under the bucket when testing or adjusting the tilt cylinder.

Specifications

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Table 1
Lift and Tilt Cylinder Speed Rate at High Idle
Description	Function	Distance	Time
Lift Cylinder Raise	RAISE	Ground to fully Raised position	6.8 ± 0.5 seconds⁽¹⁾
Lift Cylinder Lower (Power Down)	lower	Full Raised position to full lower position	3.5 ± 0.5 seconds⁽¹⁾
Lift Cylinder Lower (Float)	lower	Full raised position to full lower position	2.9 ± 0.3 seconds⁽¹⁾
Tilt Cylinder Dump	DUMP	Full Tilt Back position to full Dump position	3.0 ± 0.3 seconds⁽¹⁾
Tilt Cylinder Rack Back	rack back	Full dump position to full tilt back position	3.5 ± 0.5 seconds⁽¹⁾

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⁽¹⁾	Values are for a machine fitted with an empty general-purpose bucket

Introduction

The following procedure will check the rate of speed the lift and tilt cylinders operate.

Check Preparation

Move the machine to a flat open area so that the lift arms can be fully raised.
Engage the parking brake. Stop the engine .
Place wheel blocks in front of the wheels and behind the wheels.
Install the steering frame lock. Refer to Operation and Maintenance Manual, "Steering Frame Lock".
Start the engine and warmup the hydraulic oil.
Note: The hydraulic oil must be at normal operating temperature to obtain an accurate reading.
If the machine is equipped with the optional ride control system, move the ride control switch to the OFF position.

Check Procedure - Lift Circuit Raise

Ensure that the manual lowering ball valve is in the closed position.
Tilt back the bucket. Lower the lift arms.
Increase engine speed to high idle.
Move the joystick control lever to the full Raise position. Hold the joystick control lever in this position until the lift cylinders reach the end of the travel.
Record the time taken to raise the lift arms from the ground to the full RAISED position.
Refer to Table 1 for the time allowed for a new machine.
Lower the work tool to the ground and stop the engine.
If the travel time is not correct, check the following conditions:
- Check the engine high idle rpm
- Check the pressure setting of the line relief valve
- Check the implement pump flow
- Check the makeup valves in the main control valve
- Check the valve spools in the main control valve
- Check the piston seals in the cylinders

Check Procedure - Lift Circuit Lower (Power Down)

Tilt back the bucket. Raise the lift arms to the full Raise position.
Increase engine speed to high idle.
Move the joystick control lever to the full lower position. Hold the joystick control lever in this position until the lift cylinders reach the end of travel.
Record the time taken to lower the lift arms from the fully raise position to the full lower position.
Refer to Table 1 for the time allowed for a new machine.
Stop the engine.
If the travel time is not correct, check the following conditions:
- Check the engine high idle rpm
- Check the pressure setting the line relief valve
- Check the implement pump flow
- Check the makeup valves in the main control valve
- Check the valve spools in the main control valve
- Check the piston seals in the cylinders

Check Procedure - Lift Circuit Lower (Float)

Tilt back the bucket. Raise the lift arms to the full Raised position.
Move the lift control lever to the float position and allow the linkage to drop via gravity.
Record the time taken to lower the lift arms from full raisedto the full lower position.
Refer to Table 1 for the time allowed for a new machine.
Stop the engine.
If the travel time is not correct, check the following conditions:
- Check the pressure setting of the line relief valve
- Check the implement pump flow
- Check the makeup valves in the main control valve
- Check the valve spools in the main control valve
- Check the piston seals in the cylinders

Check Procedure - Tilt Circuit Dump

Position the lift arms to the mid lift position.
Position and the bucket to the full TILT BACK position.
Increase engine speed to high idle.
With the arms in still in the mid lift position, ensure that the tilt cylinder is in the fully extended position.
Record the time taken to move the bucket from the full TILT BACK position to the full DUMP position.
Refer to Table 1 for the time allowed for a new machine.
Lower the lift arms to the ground and stop the engine.
If the travel time is not correct, check the following conditions:
- Check the engine high idle rpm
- Check the pressure setting of the line relief valve
- Check the implement pump flow
- Check the makeup valves in the main control valve
- Check the valve spools in the main control valve
- Check the piston seals in the cylinders

Check Procedure - Tilt Circuit Tilt Back

Position the lift arms to the mid lift position.
Position the bucket to the full Dump position.
Increase engine speed to high idle.
With the arms still in the mid lift position, ensure that tilt cylinder is fully retracted.
Record the time taken to move the bucket from the full dump position to the full Tilt back position.
Refer to Table 1 for the time allowed for a new machine.
Lower the lift arms to the ground and stop the engine.
If the travel time is not correct, check the following conditions:
- Check the engine high idle rpm
- Check the pressure setting of the line relief valve
- Check the implement pump flow
- Check the makeup valves in the main control valve
- Check the valve spools in the main control valve
- Check the piston seals in the cylinders