How do I know which travel assembly fits my excavator?

Match three things: the machine class (FDNB08 and FDNB12 cover 5-10 t, FTD26 13-16 t, FTD45 18-22 t, FTD48 22-26 t), the flange and sprocket bolt pattern, and the reduction ratio from the old unit plate.

Can I repair a travel assembly instead of replacing it?

Rotary-group wear is repairable with a kit. If the planetary gears are failing - metal in the gear oil - replace or rebuild the assembly rather than continuing to work.

Why is one side weak and the other fine?

Compare the two sides at the same oil temperature: case drain flow, relief pressure and travel speed. A difference points at that motor, its brake release or the balance valve - not at the pump.

Choosing a travel assembly for your excavator

A travel assembly is the travel motor plus its two-stage planetary reducer. Five models cover the machines we ship to most often, from 5 t mini excavators to 26 t class; the same series runs to the 46-52 t class, and we quote those three sizes on request. This guide states how to pick the right one and which measurements decide it.

The five models

Model	Machine class	Displacement	Actions
FDNB08	5–6 t excavator	-	Model page
FDNB12	8–10 t excavator	-	Model page
FTD26	13–16 t excavator / drilling rig / crawler crane	-	Model page
FTD45	18–22 t excavator / drilling rig / crawler crane	-	Model page
FTD48	22–26 t excavator / drilling rig / crawler crane	-	Model page

Published figures, all eight sizes

Where the FRANK catalogue publishes a figure, that is the figure we quote and the one shown here; the manufacturer sheet figure is kept only for traceability. Torque is the Speed-1 figure and speed the Speed-2 figure these two-speed travel devices run at. The 28-52 t sizes are not in the FRANK catalogue, so their row carries the manufacturer sheet figures.

Model	Machine class	Figures from	Theoretical output torque (N·m)	Output speed (min⁻¹)	Pressure (MPa)	Brake torque (N·m)
FDNB08	5-6 t	FRANK catalogue	7,946.7	50.1	21.6 relief	137 (14 kgf·m)
FDNB12	8-10 t	FRANK catalogue	10,773	44.7	28 relief	137 (14 kgf·m)
FTD26	13-16 t	FRANK catalogue	25,056 (max. 25,800)	55.2 (max. 60)	34.3 relief	265 (27 kgf·m)
FTD45	18-22 t	FRANK catalogue	44,520 (max.)	58.8 (max.)	34.3 relief	621 (63.3 kgf·m)
FTD48	22-26 t	FRANK catalogue	47,580 (max.)	54.2 (max.)	34.3 relief	621 (63.3 kgf·m)
FTD70	28~34 t	maker sheet	70,000 (7,140 kgf·m)	50	35.8 max.	1,128 (115 kgf·m)
FTD80	36~42 t	maker sheet	79,570 (8,110 kgf·m)	43.5	35.8 max.	1,128 (115 kgf·m)
FTD100	46~52 t	maker sheet	100,100 (10,210 kgf·m)	36	35.8 max.	1,128 (115 kgf·m)

Flange and outline dimensions

Unit: mm. D1 and D4 are the pitch circles, D2 and D3 the centring diameters, L1 to L4 the axial lengths. P, Pi and Pd are the main, pilot and drain ports; S1 and S2 the bolt patterns. These are the numbers that decide whether a unit bolts onto your undercarriage.

Model	D1	D2	D3	D4	L1	L2	L3	L4	P	Pi	Pd	S1	S2
FDNB08	244	210	250	282	336.5	68	147	121.5	PF 1/2	PF 1/4	PF 3/8	12-M14	12-M14
FDNB12	250	210	265	300	355.5	80	154	121.5	PF 1/2	PF 1/4	PF 3/8	12-M14	12-M14
FTD26	280	246	324	364	412.3	99.5	192	120.8	PF 3/4	PF 1/4	PF 1/2	20-M16	15-M16
FTD45	340	300	402	440	515.5	98.5	252	165	PF1 / SAE 1"	PF 1/4	PF 1/2	30-M16	30-M16
FTD48	340	300	402	440	515.5	98.5	252	165	PF1 / SAE 1"	PF 1/4	PF 1/2	30-M16	30-M16
FTD70	425	380	450	490	575	112	290	173	SAE 1"	PF 1/4	PF 1/2	26-M20	24-M20
FTD80	425	380	450	490	575	112	290	173	SAE 1"	PF 1/4	PF 1/2	26-M20	24-M20
FTD100	460	420	510	550	634	130	331	173	SAE 1 1/4"	PF 1/4	PF 1/2	24-M24	32-M20

How to identify the one on your machine

Track gauge and sprocket

The mounting flange and sprocket bolt pattern differ between classes. Measure the flange bolt circle before ordering.

Undercarriage class

FDNB08 and FDNB12 are for 5-10 t, FTD26 for 13-16 t, FTD45 for 18-22 t and FTD48 for 22-26 t. Stepping up adds torque but also requires more flow.

Ratio and travel speed

Two-stage planetary ratios set travel speed and gradeability. Confirm the ratio from the old unit, not from the machine model alone.

Brake and valve

The parking brake and the counterbalance valve must suit the machine's hydraulic settings. Send the unit plate and we verify.

Before condemning the assembly

Most travel faults we are asked about are not the motor. Check, in order: track tension and undercarriage seizure, travel relief pressure on each side, the balance valve spool, brake release pressure, and case drain flow on both sides at the same oil temperature. A difference between sides matters more than an absolute number. Only then open the reducer - metal in the gear oil means the planetary set is failing and continuing to work will destroy the housing.

The full sequence is in our travel fault diagnosis guide, which you can work through with a gauge before ordering anything.

Source and scope. Where the FRANK English catalogue (65 p, travel device section) publishes a figure — application class, flow, relief valve set pressure, gear ratio, displacement, output speed and output torque — that is the figure quoted here. The brake torque, maximum pressure and the flange / bore data come from the manufacturer's FTD / FDNB travel device sheet (PNM FK Co., Ltd., pnmfk.co.kr), unit mm, which the FRANK catalogue does not publish. Figures are facts of the product. Confirm the flange, ratio, brake and control variant with our team before ordering — treat the manufacturer EPC as the final authority.

Confirm my travel assembly Travel fault guide By machine model